September 2026 observances

Building and Code Staff Appreciation Day

United States / professional appreciation observance with local-government proclamation evidence

The City of Lodi states in its 2026 proclamation background that Building and Code Staff Appreciation Day is observed annually on September 1; EventGuide independently lists September 1 eac…

Constitution Day

Slovak Republic

Australia’s Department of Foreign Affairs and Trade current National Days protocol register lists Slovak Republic — Constitution Day on 1 September. The source verifies the diplomatic natio…

Ginger Cat Appreciation Day

Informal pet-appreciation calendar usage documented by a veterinary institution

The Animal Medical Center lists Ginger Cat Appreciation Day on September 1 in its 2025 and 2026 pet-awareness calendars.

Independence Day of the Republic of Uzbekistan

Uzbekistan

A 2026 government page identifies 1 September as Independence Day of the Republic of Uzbekistan and describes it as the main national holiday.

National Child Identity Theft Awareness Day

United States / Experian-created child identity-theft awareness campaign

Experian states that it designated September 1 as National Child Identity Theft Awareness Day and uses the date for public education on child identity theft.

National Little Black Dress Day

United States / Black Heart Association cardiovascular-awareness initiative

The Black Heart Association states that National Little Black Dress Day is observed annually on September 1 and that the association created it in 2020.

National No Rhyme Nor Reason Day

Informal / novelty-language observance

timeanddate and National Today independently place the informal No Rhyme or Reason observance on September 1.

National Tofu Day

Primarily United Kingdom/informal consumer food-calendar context

Consumer/calendar and corporate campaign material identify September 1 as National Tofu Day; the evidence is treated as informal and geographically cautious.

National Wattle Day

Australia national floral-emblem commemoration

The Australian Government states that 1 September is National Wattle Day and records that the observance was officially proclaimed on 23 June 1992; current 2026 government material continue…

World Letter Writing Day

Global / World Letter Writing Day founder-led initiative

World Letter Writing Day’s official site documents its launch on 1 September 2014 and continues to identify 1 September as the celebration date.

Commemoration of the Surrender of General Tomoyuki Yamashita

Special nonworking holiday in the Province of Ifugao, Philippines

Republic Act No. 11120

Día de Ceuta

Public holiday in the Autonomous City of Ceuta

Autonomous City of Ceuta

Global Talent Acquisition Day

Talent acquisition profession / ATAP creator-origin observance

The Association of Talent Acquisition Professionals and KRT Marketing launched Global Talent Acquisition Day in 2018 and stated that it would be held on the first Wednesday of September eve…

Indigenous Literacy Day

Australia / First Nations stories, cultures and languages

The Indigenous Literacy Foundation states that Indigenous Literacy Day is a national celebration created by the Foundation, held on the first Wednesday of September; in 2026 it was celebrat…

National Blueberry Popsicle Day

Informal food-calendar usage documented by Association of Nutrition & Foodservice Professionals chapter material

Two Association of Nutrition & Foodservice Professionals chapter calendars from different publication years list National Blueberry Popsicle Day on 2 September.

National Day of Viet Nam

Viet Nam / national day

The official Government of Viet Nam information channel identifies 2 September as National Day and documented the 81st National Day anniversary in 2026.

National Live Fearless Day

United States / Landry Champlin-created personal-development observance

Landry Champlin states that she created a national holiday, and National Day Archives records National Live Fearless Day as September 2 each year with Champlin as the 2020 creator.

Spalding Baseball Day

United States baseball-history appreciation / Albert G. Spalding birthday anchor

SABR’s biographical record places Albert Goodwill Spalding’s birth on 2 September 1850; an independent event-calendar reference corroborates Spalding Baseball Day on 2 September.

World Coconut Day

Intergovernmental-body-backed sector observance

International Coconut Community (ICC)

Foundation Day / National Day of San Marino

San Marino

Government diplomatic sources identify 3 September as San Marino’s national/foundation day

Merchant Navy Day

United Kingdom

GOV.UK marks Merchant Navy Day on 3 September and describes the contribution of merchant seafarers

College Colors Day

Collegiate Licensing Company / U.S. college-fan campaign

The official College Colors Day campaign identifies the annual fan celebration and its 2026 date

Feast of Saint Rosalia

Catholic Church / Saint Rosalia, patron saint of Palermo

Vatican News’ saint calendar places Saint Rosalia, Virgin of Palermo, on September 4.

Janmashtami

India / 2026 Central Government office holiday calendar reference (Assam)

The Government of India Controller of Communication Accounts, Assam lists Janmashtami on 4 September 2026 in its 2026 gazetted-holiday calendar.

National Food Bank Day

United States / St. Mary’s Food Bank-origin service campaign

St. Mary’s Food Bank describes National Food Bank Day as its own national holiday now celebrated nationwide and lists the 2026 event on September 4. The current first-party page verifies th…

National Lazy Mom’s Day

United States / informal family-and-rest observance

National Day Calendar and Days Of The Year independently define Lazy Mom’s Day as the first Friday in September each year.

National Wildlife Day

United States / creator-led wildlife awareness observance

Creator Colleen Paige’s official site lists National Wildlife Day on September 4 among the observances she founded/maintains.

Taekwondo Day

Organizer-backed worldwide sport observance

World Taekwondo

World Sexual Health Day

Organizer-backed global sexual-health awareness observance

World Association for Sexual Health (WAS)

International Day of Charity

United Nations international observance

A/RES/67/105

International Day of the World's Indigenous Women and Girls

United Nations / international observance

A/RES/80/10

Mother Teresa Day (Dita e Nënë Terezës)

Albania / national public holiday and commemoration

The Embassy of India in Tirana states that Albania observes Mother Teresa Day as an official national public holiday on September 5 each year, linked to her canonization and death anniversa…

National Be Late for Something Day

United States / informal lifestyle observance

National Day Calendar and National Today independently place National Be Late for Something Day on September 5 each year.

National Cheese Pizza Day

United States / informal food observance

Pizza Hut first-party campaign material and contemporaneous brand releases repeatedly use September 5 for National Cheese Pizza Day.

National Hummingbird Day

United States / informal hummingbird-themed observance

Established observance references identify National Hummingbird Day as the first Saturday in September; current references also state that no known creator has been established.

Dia di Boneiru, Dia di Himno i Bandera

Bonaire / special public observance and island national day

The Dutch central government lists 6 September for Bonaire as Dia di Boneiru, Dia di Himno i Bandera; Bonaire’s public body called 6 September 2026 its national day and published the offici…

Eswatini Independence Day

Kingdom of Eswatini / national holiday

The Permanent Mission of the Kingdom of Eswatini to the United Nations identifies Independence Day on 6 September and records independence on 6 September 1968.

National Coffee Ice Cream Day

Informal food-calendar usage documented by Association of Nutrition & Foodservice Professionals chapter material

Two Association of Nutrition & Foodservice Professionals chapter calendars from different publication years list National Coffee Ice Cream Day on 6 September.

National Grandparents Day

United States / statutory national observance

36 U.S.C. §125 requests an annual presidential proclamation designating the first Sunday in September after Labor Day as National Grandparents Day.

National Pet Rock Day

United States / informal novelty-pet observance

National Today and Days Of The Year independently define Pet Rock Day as the first Sunday in September each year.

National Read a Book Day

United States / informal reading observance recognized by public libraries

Wyoming State Library states that National Read a Book Day is celebrated each September 6; a New Jersey public library independently lists the observance on September 6, 2026.

Buy a Book Day

International / informal book and reading observance

National Today places Buy a Book Day on September 7 annually, and EventGuide independently lists it every September 7.

Independence Day

Brazil

Australia’s Department of Foreign Affairs and Trade current National Days protocol register lists Brazil — Independence Day on 7 September. The source verifies the diplomatic national-day i…

International Day of Clean Air for Blue Skies

UNEP / United Nations / international observance

A/RES/74/212

International Day of Police Cooperation

United Nations / international observance

A/RES/77/241

Labor Day

United States federal holiday

U.S. Office of Personnel Management / 5 U.S.C. 6103

Labour Day

Canada

Canada Revenue Agency lists Labour Day as a recognized 2026 public holiday

National Beer Lovers Day

United States / informal beer observance documented by brewery and current calendar usage

Cape May Brewing Company explicitly celebrated National Beer Lovers Day on September 7, and National Today independently records the observance every September 7.

National Grateful Patient Day

United States / grateful-patient recognition initiative founded by Rolf Benirschke

National Day Calendar’s proclamation identifies Rolf Benirschke as founder and September 7 as the annual observance date; health-system foundation materials also use September 7.

National New Hampshire Day

United States / National Day Calendar National State Days series — New Hampshire

National Day Calendar lists National New Hampshire Day on 7 September. The U.S. Senate records New Hampshire’s admission/statehood date as 21 June 1788. The two dates are deliberately kept…

World Duchenne Awareness Day

United Nations / international observance

A/RES/78/12

Dia de Meritxell / Mare de Déu de Meritxell

Andorra / national holiday and patronal observance

The Government of Andorra identifies 8 September as the feast of the Virgin of Meritxell and a national holiday in the Andorran labor calendar.

International Literacy Day

UNESCO international observance

UNESCO 14 C/Resolution 1.441

National Dog Walker Appreciation Day

United States / Wag!-created dog-walker recognition day

Wag! announced the first annual National Dog Walker Appreciation Day for September 8, 2016 and established September 8 as the recognition date.

National Iguana Awareness Day

United States / informal reptile-awareness observance documented by veterinary calendars

The Animal Medical Center repeatedly lists National Iguana Awareness Day on September 8 in annual calendars from 2022 through 2026.

Pediatric Hematology/Oncology Nurses’ Day

Pediatric hematology/oncology nursing profession / APHON

The Association of Pediatric Hematology/Oncology Nurses states that Pediatric Hematology/Oncology Nurses’ Day was established by APHON in 2010 and is celebrated every year on September 8.

Star Trek Day

Star Trek franchise / Paramount+ fandom observance

Paramount+ states that Star Trek Day is celebrated annually on 8 September, commemorating the original series premiere on 8 September 1966.

World PT Day

Organizer-backed international observance

World Physiotherapy

California Admission Day

California commemorative day

California Department of Education / California State Parks

Emergency Services Day (999 Day)

United Kingdom / Emergency Services Day campaign

The official 999 Day site states that Emergency Services Day is held on 9 September each year and describes it as a national day across the UK.

International Box Wine Day

International / informal wine observance

Wine International Association lists International Box Wine Day on September 9 in its wine-days calendar, while Days Of The Year independently gives the observance a September 9 annual recu…

International Day to Protect Education from Attack

United Nations international observance

A/RES/74/275

International FASD Awareness Day

Global / FASD United awareness campaign

FASD United’s 2026 awareness-month material states that September 9 is International FASD Awareness Day each year and frames it around awareness, understanding, support and systems change.

International Sudoku Day

International puzzle-community observance

Logic Masters India records the World Puzzle Federation’s announcement of 9/9 as International Sudoku Day; an institute under Turkmenistan’s Ministry of Foreign Affairs independently record…

State Independence Day of the Republic of Tajikistan

Tajikistan / national independence observance

The President of Tajikistan’s official site marked 9 September 2025 as the anniversary of State Independence and states that Tajikistan declared independence on that date in 1991.

Wonderful Weirdos Day

United States / creator-defined informal Wellcat observance

The first-party Wellcat Holidays calendar lists Wonderful Weirdos Day on September 9 and identifies the collection as created by Thomas and Ruth Roy.

National 401(k) Day™

United States / retirement-plan education

The Plan Sponsor Council of America maintains National 401(k) Day™ and explains its traditional timing after Labor Day

National School Picture Day

United States / Lifetouch-created school-photography observance

Lifetouch states that it declared National School Picture Day in 2019 and set it for the second Thursday in September each year.

R U OK?Day

Australia suicide-prevention conversation and connection campaign

A current NSW Government event page identifies R U OK?Day on 10 September 2026 and describes the campaign as encouraging meaningful conversations and connection.

St. George’s Caye Day

Belize / public and bank holiday

Belize’s Government Press Office 2026 holiday notice lists Thursday, 10 September 2026 as St. George’s Caye Day under the Holidays Act.

TV Dinner Day

Informal food-calendar usage documented by Association of Nutrition & Foodservice Professionals chapter material

Two Association of Nutrition & Foodservice Professionals chapter calendars from different publication years list TV Dinner Day on 10 September.

World Suicide Prevention Day

Global observance led by IASP with WHO support

National Make Your Bed Day

United States / informal lifestyle observance

National Day Calendar consistently places National Make Your Bed Day on September 11 and explicitly notes that its origin is unidentified.

Patriot Day

United States national day of remembrance

U.S. Government Publishing Office

Farmers Consumer Awareness Day

Quincy, Washington / long-running farmer-consumer education event

Farmers Consumer Awareness Day in Quincy is held on the second Saturday in September; the community event traces its program to 1981.

International Drive Your Studebaker Day

International / Studebaker Drivers Club official event

The Studebaker Drivers Club identifies International Drive Your Studebaker Day as an official SDC event held on the second Saturday in September and lists 12 September for 2026.

National Chocolate Milkshake Day

Informal food-calendar usage documented by Association of Nutrition & Foodservice Professionals chapter material

Two Association of Nutrition & Foodservice Professionals chapter calendars from different publication years list National Chocolate Milkshake Day on 12 September.

National Police Woman Day

United States / police-women recognition observance supported by state and municipal proclamations

North Carolina’s 2025 gubernatorial proclamation states that National Police Woman Day is observed annually on September 12; other public bodies have recognized the same date.

National Report Medicare Fraud Day

United States / Hesch Firm-created anti-fraud awareness observance recognized in FBI public outreach

FBI Phoenix explicitly recognized National Report Medicare Fraud Day on September 12, while observance records attribute the campaign to former DOJ attorney Joel Hesch and the Hesch Firm.

Tag der deutschen Sprache (German Language Day)

German-language community / organizer-led observance

Verein Deutsche Sprache is the primary organizer and identifies the annual German Language Day campaign

United Nations Day for South-South Cooperation

United Nations / international observance

A/RES/58/220

World First Aid Day

Organizer-backed global first-aid awareness observance

International Federation of Red Cross and Red Crescent Societies (IFRC)

International Chocolate Day

International / informal chocolate observance

National Today gives International Chocolate Day a fixed September 13 recurrence, and Retail Confectioners International independently promoted International Chocolate Day on September 13.

International Day of Caves and Karst

UNESCO international day

IRONMAN Wales

Tenby, Pembrokeshire triathlon event

IRONMAN

National Celiac Disease Awareness Day

United States / celiac-disease awareness recognition

A U.S. Senate resolution designated 13 September 2010 as National Celiac Disease Awareness Day, and Beyond Celiac continued to mark 13 September as the awareness day in its 2026 materials.

National Hug Your Hound Day

United States / pet appreciation observance

National Day Calendar identifies National Hug Your Hound Day as the second Sunday in September and attributes its creation to Ami Moore. Independent calendar corroboration produces dates co…

National Pet Memorial Day

International Association of Pet Cemeteries and Crematories remembrance observance

The International Association of Pet Cemeteries and Crematories says National Pet Memorial Day is observed on the second Sunday in September and was established by the association in 1971.

National Pet Remembrance Day

Pet-loss remembrance / organizer-led annual observance

The official Pet Remembrance Day site states that National Pet Remembrance Day is observed on the second Sunday in September.

Pet Birth Defect Awareness Day

Pet/veterinary awareness-calendar usage

The Animal Medical Center lists Pet Birth Defect Awareness Day on September 13 in multiple annual veterinary-awareness calendars.

Roald Dahl Story Day

Literacy/storytelling celebration and charity fundraising context

Roald Dahl’s Marvellous Children’s Charity currently promotes Roald Dahl Story Day as an annual global celebration beginning from 13 September, with schools able to choose a suitable partic…

Uncle Sam Day in the State of New York

New York State, United States / statutory commemorative day

New York Executive Law §168-a expressly lists September 13 as Uncle Sam Day in the State of New York.

World Sepsis Day

Organizer-backed international observance

Global Sepsis Alliance (GSA)

Fast of Gedaliah / Tzom Gedaliah

Jewish minor fast and remembrance observance

Chabad’s current Jewish calendar lists the Fast of Gedaliah on 14 September 2026 (3 Tishrei 5787).

Ganesh Chaturthi / Vinayaka Chaturthi

India and Hindu communities; movable religious festival

A Government of India holiday calendar lists Ganesh Chaturthi / Vinayaka Chaturthi on 14 September 2026.

National Cream Filled Donut Day

Informal food-calendar usage documented by Association of Nutrition & Foodservice Professionals chapter material

Two Association of Nutrition & Foodservice Professionals chapter calendars from different publication years list National Cream Filled Donut Day on 14 September.

National Rosa Tequila Day

International / informal tequila-industry observance

National Today and Awareness Days independently place National Rosa Tequila Day on September 14; Awareness Days describes it as an informal industry-driven observance.

National Virginia Day

United States / National Day Calendar National State Days series — Virginia

National Day Calendar lists National Virginia Day on 14 September. The U.S. Senate records Virginia’s admission/statehood date as 25 June 1788. These are separate facts: the calendar listin…

World Atopic Eczema Day

Organizer-backed global health awareness observance

GlobalSkin and the international atopic-eczema community

Get Ready Day

American Public Health Association / emergency preparedness

APHA places Get Ready Day on the third Tuesday in September as part of its preparedness initiative

Grito de Independencia / Grito de Dolores

Mexico; national independence commemoration tradition

Government of Mexico material describes the Grito de Independencia ceremony on 15 September, commemorating the historical call associated with the start of independence.

Independence Day

Costa Rica

Australia’s Department of Foreign Affairs and Trade current National Days protocol register lists Costa Rica — Independence Day on 15 September. The source verifies the diplomatic national-…

Independence Day

El Salvador

Australia’s Department of Foreign Affairs and Trade current National Days protocol register lists El Salvador — Independence Day on 15 September. The source verifies the diplomatic national…

Independence Day

Guatemala

Australia’s Department of Foreign Affairs and Trade current National Days protocol register lists Guatemala — Independence Day on 15 September. The source verifies the diplomatic national-d…

Independence Day

Honduras

Australia’s Department of Foreign Affairs and Trade current National Days protocol register lists Honduras — Independence Day on 15 September. The source verifies the diplomatic national-da…

International Day of Democracy

United Nations / international observance

A/RES/62/7

IT Professionals Day / IT Pro Day

SolarWinds-created technology-professional appreciation observance

SolarWinds says IT Professionals Day was established in 2015 and is celebrated on the third Tuesday of each September.

National Africa Civility Day

Africa-focused / World Civility Presidential Club-created humanitarian recognition observance

National Day Archives records September 15 and credits World Civility Presidential Club with founding the observance in 2020; current awareness calendars retain September 15.

National Cheese Toast Day

United States / Sizzler-created branded food observance

Sizzler’s own press releases celebrate National Cheese Toast Day on September 15 and identify the chain’s participation in the observance.

National Double Cheeseburger Day

United States / informal food observance

Independent observance calendars identify September 15 as National Double Cheeseburger Day.

National Online Learning Day

United States / online-learning community observance registered in 2016

National Day Calendar states the observance was established in 2016 and proclaimed for September 15 annually; universities continue to recognize the same date.

National Tackle Kids Cancer Day

United States / Tackle Kids Cancer and Hackensack University Medical Center Foundation recognition

National Day Calendar records September 15 as the annual observance, beginning in 2017, and identifies Hackensack University Medical Center Foundation as the founder.

World Afro Day

global Afro-hair celebration, education and anti-discrimination observance

World Afro Day organization; first event endorsed by the UN Office of the High Commissioner for Human Rights

Independence Day

Papua New Guinea

Australia’s Department of Foreign Affairs and Trade current National Days protocol register lists Papua New Guinea — Independence Day on 16 September. The source verifies the diplomatic nat…

International Day for Interventional Cardiology

United Nations / international observance

A/RES/76/302

International Day for the Preservation of the Ozone Layer

United Nations / international observance

A/RES/49/114

International Day of Science, Technology and Innovation for the South

United Nations / international observance

A/RES/78/259

Malaysia Day

Malaysia national public holiday / national celebration

Government of Malaysia official portal

Mexico Independence Day

Mexico

The Organization of American States’ current country page lists Mexico National Independence Day as 16 September.

National Cinnamon Raisin Bread Day

United States / informal food observance

National Day Calendar and National Today independently place National Cinnamon Raisin Bread Day on September 16 each year.

National PLAY-DOH Day

United States / Hasbro-created PLAY-DOH brand observance

Hasbro states that National PLAY-DOH Day is celebrated annually on September 16 and was created by Hasbro in 2006; Hasbro later expanded the celebration globally as World PLAY-DOH Day.

National Stepfamily Day

United States / family-awareness observance founded by Christy Tusing-Borgeld

The U.S. Census Bureau identifies September 16 as Stepfamily Day and traces the observance to Christy Tusing-Borgeld in 1997.

National Working Parents Day

United States / informal working-parents appreciation observance

National Day Archives places National Working Parents Day on September 16.

World Barber Day

international barber-community and giving-back observance

World Barber Day organizers; launched in Ireland in 2017

AKC Responsible Dog Ownership Day

American Kennel Club / responsible dog ownership campaign

The American Kennel Club designated September 17, the anniversary of the AKC’s founding, as AKC Responsible Dog Ownership Day and continues to publish the observance through its Responsible…

Australian Citizenship Day

Australian national citizenship observance

Australian Department of Home Affairs

Constitution Day and Citizenship Day

United States

The U.S. Courts’ official educational observance page identifies Constitution Day and Citizenship Day around 17 September, the anniversary of the Constitution’s signing.

International Country Music Day

International / informal country-music appreciation observance

Timeanddate identifies September 17 as International Country Music Day and treats it as an unofficial observance.

National Apple Dumpling Day

Informal food-calendar usage documented by Association of Nutrition & Foodservice Professionals chapter material

Two Association of Nutrition & Foodservice Professionals chapter calendars from different publication years list National Apple Dumpling Day on 17 September.

National DEI Day

United States / National DEI Day organizer-led observance

The National DEI Day organizer site states that the observance is held each year on September 17, deliberately coinciding with U.S. Constitution Day and Citizenship Day.

National Pawpaw Day

Kentucky State University agriculture and native-fruit awareness observance

Kentucky State University documents National Pawpaw Day as the third Thursday of each September, created to increase awareness of the native pawpaw fruit.

National Pet Bird Day

United States-origin / Bird Enjoyment & Advantage Koalition companion-bird campaign

The Bird Enjoyment & Advantage Koalition states that it created National Pet Bird Day in 2019 and that the observance takes place on September 17 each year.

National Pet Carbon Monoxide (CO) Safety Day

United States and Canada / Kidde-origin pet carbon-monoxide safety campaign

Kidde’s campaign announcement identifies September 17 as National Pet Carbon Monoxide Awareness/Safety Day and ties the observance to pet-owner carbon-monoxide education.

National Professional House Cleaners Day

United States / American House Cleaners Association-founded professional recognition

National Day Calendar records the American House Cleaners Association as founder and September 17 as the annual observance date.

World Patient Safety Day

World Health Organization global health observance

WHO observance

World Quantum Readiness Day

DigiCert-organized global virtual cybersecurity and post-quantum-readiness event

DigiCert’s current event page and August 2026 announcement identify the third annual World Quantum Readiness Day on 17 September 2026.

Chile Independence Day

Chile

The Organization of American States’ current country page lists Chile National Independence Day as 18 September.

International Equal Pay Day

United Nations international observance

A/RES/74/142

International Grenache Day

International Grenache/wine-community observance

Wine International Association’s current 2026 calendar places International Grenache Day on 18 September and identifies the third-Friday rule; Grenache Association campaign material documen…

National Cheeseburger Day

United States / informal food observance with first-party burger-brand corroboration

Wendy’s first-party material identifies September 18 as National Cheeseburger Day.

National Concussion Awareness Day®

United States / organizer-led concussion awareness

The official National Concussion Awareness Day site identifies Friday, September 18, 2026, states that the observance is recognized on the third Friday of September yearly, and describes it…

National First Love Day

United States / informal relationship observance

National Today gives National First Love Day a fixed September 18 recurrence, and Days Of The Year independently lists National First Love Day on September 18.

National HIV/AIDS and Aging Awareness Day

United States / HIV and aging awareness

HIV.gov states that National HIV/AIDS and Aging Awareness Day is observed each year on September 18 and focuses on people aging with HIV and their health and social needs.

National POW/MIA Recognition Day

United States / Department of Defense remembrance observance

The Defense POW/MIA Accounting Agency states that National POW/MIA Recognition Day was established in 1979 and is observed annually on the third Friday of September to honor former POWs and…

National Report Kickback Fraud Day

United States / informal anti-fraud awareness campaign

Current observance material identifies September 18 and attributes the awareness day to attorney and former federal prosecutor Joel D. Hesch.

National Respect Day

United States / respect-in-relationships and violence-prevention awareness campaign associated with Futures Without Violence and Macy’s

A 2024 local-news explainer attributes National Respect Day to the Futures Without Violence–Macy’s partnership; independent observance documentation records 18 September annually from 2009…

Read an Ebook Day

OverDrive / organizer-led reading campaign

OverDrive states that Read an Ebook Day takes place every September 18 and documents the campaign’s 2014 launch.

World Bamboo Day

Organizer-backed global sustainability observance

World Bamboo Organization (WBO)

World Water Monitoring Day

international water-quality awareness and citizen-action observance

EarthEcho International / Water Challenge program

Aortic Dissection Awareness Day

Global / aortic-disease awareness campaign

The Aortic Dissection Charitable Trust states that September 19 marks Aortic Dissection Awareness Day every year and lists a global September 19, 2026 event.

Batman Day

DC / global Batman fan event

DC’s official Batman Day announcement identifies the 2026 event date and fan celebration

Boys’ and Girls’ Club Day for Kids

United States / youth-community observance associated with Boys & Girls Clubs

Current observance calendars consistently place Boys’ and Girls’ Club Day for Kids on the third Saturday of September.

Día de las Glorias del Ejército

Chile Army civic-military commemoration and legal holiday

Chilean Army; legal-holiday tradition traced to a 1915 decree

International Coastal Cleanup®

Ocean Conservancy / global cleanup campaign

Ocean Conservancy states that the International Coastal Cleanup is held annually on the third Saturday of September, with many cleanups also occurring throughout the month.

International Eat An Apple Day

International / informal food observance

National Day Calendar and National Today independently define International Eat an Apple Day as the third Saturday in September each year.

International Red Panda Day

international red-panda conservation awareness observance

Red Panda Network

International Talk Like a Pirate Day

Founder-created international novelty observance

TIME documents International Talk Like a Pirate Day as an annual 19 September observance created by John Baur and Mark Summers in 1995.

National Butterscotch Pudding Day

Informal food-calendar usage documented by Association of Nutrition & Foodservice Professionals chapter material

Two Association of Nutrition & Foodservice Professionals chapter calendars from different publication years list National Butterscotch Pudding Day on 19 September.

National Cartonnage Day

United States / cartonnage craft community

National Day Archives records Colorway Arts as the creator and states the observance occurs on the third Saturday of September; Colorway Arts documents the original September 18, 2021 event.

National Cat DNA Day

United States / Basepaws-origin feline-genetics awareness day

National Day Archives records September 19 and identifies Basepaws as the 2020 founder; Basepaws continues to reference National Cat DNA Day in its own materials.

National CleanUp Day

United States / organizer-led volunteer cleanup campaign

The official National CleanUp Day organization states that the observance takes place every year on the third Saturday in September.

National Dance Day

United States / American Dance Movement annual dance-participation observance

American Dance Movement states that National Dance Day was established in 2010 and, since 2019, takes place annually on the third Saturday in September.

National Gymnastics Day

USA Gymnastics participation and sport-promotion observance

USA Gymnastics’ National Gymnastics Day page identifies the current 2026 celebration and associated #NGD2026 participation.

National Multivitamin Day

United States / GNC-created consumer awareness observance

GNC launched the first National Multivitamin Day in 2024 and states that the observance is held on the third Saturday of September; current 2026 calendar treatment resolves that rule to Sep…

Puppy Mill Awareness Day

United States-origin / animal-welfare awareness campaign

Last Chance for Animals states that Puppy Mill Awareness Day began in 2004 and is held annually on the third Saturday of September.

Usher Syndrome Awareness Day

Usher Syndrome Coalition / global awareness campaign

The Usher Syndrome Coalition states that Global Usher Syndrome Awareness Day is observed on the third Saturday in September and lists 19 September for 2026.

International Day of University Sport

UNESCO international day

National Care for Kids Day®

United States / Care for Kids and Designetics Cares-created child-support observance

Designetics states it created National Care for Kids Day to be held annually on September 20, and the Care for Kids organization lists the September 20, 2026 edition.

National Crime and Intelligence Analyst Appreciation Day

United States / crime and intelligence analyst professional recognition created by FCIAA

The Florida Crime & Intelligence Analyst Association states that it created NCIAAD in 2021 and promotes the sixth annual observance on September 20, 2026; IALEIA also recognizes the day.

National Fried Rice Day

United States / Benihana-created food observance

Benihana declared September 20 the first annual National Fried Rice Day in 2018 and has continued to associate the observance with that date.

National String Cheese Day

United States / Galbani Cheese-founded informal food observance registered through National Day Calendar

National Day Calendar’s proclamation record identifies Galbani Cheese as the 2017 founder and establishes September 20 as the annual observance date.

NFT Day / International NFT Day

Web3 industry / creator consortium observance

The inaugural NFT Day announcement says a consortium of Web3 companies launched NFT Day on September 20, 2022 as an annual moment for the community, tied to the 2017 publication of the ERC-…

Weltkindertag (World Children’s Day in Germany)

Germany / World Children’s Day; statutory public holiday in Thuringia, not nationwide

UNICEF Germany states that Weltkindertag is observed every September 20; it has been a statutory public holiday in Thuringia since 2019.

World Cleanup Day

United Nations / international observance

A/RES/78/122

Yom Kippur

Jewish calendar / Israel Ministry of Foreign Affairs 2026 schedule

The Embassy of Israel’s Ministry of Foreign Affairs 2026 schedule lists Yom Kippur Eve on 20 September and Yom Kippur on 21 September 2026.

Belize Independence Day

Belize

The Organization of American States’ current country page lists Belize National Independence Day as 21 September.

Independence Day

Armenia

The Government of Armenia’s Independence Day message is dated 21 September and explicitly identifies the occasion as Republic of Armenia Independence Day.

Independence Day

Malta

Australia’s Department of Foreign Affairs and Trade current National Days protocol register lists Malta — Independence Day on 21 September. The source verifies the diplomatic national-day i…

International Day of Peace

United Nations / international observance

A/RES/36/67

National Cat & Dog Gut Health Awareness Day

Pet-health awareness / AnimalBiome-sponsored campaign; veterinary-calendar corroboration

AnimalBiome’s press material documents the awareness-day launch, while Animal Medical Center veterinary-awareness calendars repeatedly list National Cat & Dog Gut Health Awareness Day on Se…

National Opioid Awareness Day

United States / opioid-awareness observance recognized by the Indian Health Service

The U.S. Indian Health Service identifies September 21 as National Opioid Awareness Day in its public-health education material.

National Pecan Cookie Day

United States / informal food-observance usage; date corroborated by a public university event and a dedicated calendar source, with origin unresolved

The University of North Texas scheduled a National Pecan Cookie Day event on September 21, 2023; National Day Calendar likewise places the recurring informal observance on September 21 whil…

Respect for the Aged Day (敬老の日)

Japan / national holiday rule

Japan’s Cabinet Office explains that Respect for the Aged Day has fallen on the third Monday of September since 2003; in 2026 that is 21 September. It separately identifies 15 September as…

World Alzheimer’s Day

Organizer-backed international observance

Alzheimer's Disease International (ADI)

World Mini Golf Day

International / informal miniature-golf observance

National Today places World Mini Golf Day on September 21, while Days Of The Year independently lists Miniature Golf Day on the same annual date.

Elephant Appreciation Day

Informal elephant-appreciation observance documented by zoo and Smithsonian institutional sources

Jacksonville Zoo explicitly identifies September 22 as Elephant Appreciation Day, and Smithsonian Libraries published an Elephant Appreciation Day feature on September 22, 2010.

Hobbit Day

Tolkien literary-fandom observance

The American Tolkien Society identifies 22 September as Hobbit Day, connecting the date to the birthdays of Bilbo and Frodo Baggins and documenting the society’s observance tradition.

National Girls' Night In Day

United States / Ketel One Botanical brand-created observance

National Day Calendar’s proclamation archive states that Ketel One Botanical founded the observance in 2018 and set it annually for September 22.

National Ice Cream Cone Day

United States / informal food observance with ice-cream-brand calendar corroboration

Hershey’s Ice Cream promotional planning material identifies September 22 as National Ice Cream Cone Day.

Proclamation of Independence

Mali

Australia’s Department of Foreign Affairs and Trade current National Days protocol register lists Mali — Proclamation of Independence on 22 September.

World Rhino Day

international rhino awareness and conservation observance

World Rhino Day campaign; first announced by WWF-South Africa

Celebrate Bisexuality Day

Bisexual+ community visibility and awareness observance

GLAAD’s LGBTQ community calendar states that Bisexual+ Awareness Week culminates in Celebrate Bisexuality Day on 23 September.

International Day of Sign Languages

United Nations / international observance

A/RES/72/161

National Apple Cider Vinegar Day

United States / Bragg-created brand observance

Bragg states that National Apple Cider Vinegar Day is celebrated on September 23 and identifies the observance as a Bragg-created campaign.

National Field Marketer’s Day

United States / Splash-created field-marketing recognition observance

Splash created the inaugural National Field Marketer’s Day for September 23, 2021 and states in its launch announcement that it planned the day to become an annual celebration; the registry…

National Great American Pot Pie Day

United States / Marie Callender’s-created food observance

National Day Calendar records September 23 as National Great American Pot Pie Day and attributes creation of the observance to Marie Callender’s in 2002.

National Snack Stick Day

United States / Klement’s-created snack-stick celebration

Klement’s company history states that it founded National Snack Stick Day in 2016 and ties the celebration to September 23.

National White Chocolate Day

Informal food-calendar usage documented by Association of Nutrition & Foodservice Professionals chapter material

Two Association of Nutrition & Foodservice Professionals chapter calendars from different publication years list National White Chocolate Day on 23 September.

RLS Awareness Day

Restless Legs Syndrome Foundation / awareness campaign

The Restless Legs Syndrome Foundation’s own materials identify 23 September as RLS Awareness Day and describe participation in the annual awareness campaign.

September equinox

Global astronomical event / USNO 2026 season table

The U.S. Naval Observatory gives the September 2026 equinox at 00:05 UT on 23 September.

September equinox (Northern Hemisphere fall equinox)

Astronomical event / Northern Hemisphere seasonal naming

The U.S. Naval Observatory gives the September equinox at 00:05 UT on 23 September 2026; seasonal naming depends on hemisphere.

Día de Nuestra Señora de las Mercedes

Dominican Republic / 2026 national holiday calendar

The Dominican Ministry of Labor’s official 2026 holiday notice lists 24 September, Día de Nuestra Señora de las Mercedes, and states that it is not moved.

Heritage Day

South Africa

South African Government lists Heritage Day as a public holiday and describes its purpose around cultural wealth, diversity and living heritage

Lash Stylists’ Day

International beauty industry / Noble Lashes creator-defined observance

Noble Lashes’ own site lists its September 24 Lash Stylist Day initiative; current awareness documentation attributes the 2018 creation to Noble Lashes and uses September 24 annually.

National Punctuation Day

United States / privately founded language-awareness observance

CBS coverage identifies National Punctuation Day as a 24 September observance created by Jeff Rubin in 2004.

Remember Me Thursday®

Helen Woodward Animal Center / pet-adoption awareness campaign

The official Remember Me Thursday site gives 24 September 2026 for the current campaign and centers orphan pets awaiting homes.

World Maritime Day

United Nations / IMO international observance

IMO / UN observance

California Native American Day

California, United States / state observance and school-calendar framework

California Department of Education material identifies Native American Day on the fourth Friday in September, while Bureau of Indian Affairs history describes California’s state recognition…

Friday before the AFL Grand Final

Victorian public holiday; date varies with the AFL Grand Final

Business Victoria

International Ataxia Awareness Day

International ataxia-awareness effort

The National Ataxia Foundation states that International Ataxia Awareness Day is on September 25 each year and is a coordinated effort involving individuals and ataxia organizations around…

Macmillan Coffee Morning

United Kingdom / Macmillan Cancer Support fundraising campaign

Macmillan Cancer Support identifies Friday 25 September 2026 as the official Coffee Morning day while explicitly allowing supporters to host on a different date.

Math Storytelling Day

International / Natural Math community-created educational observance

Natural Math’s first-party toolkit says Math Storytelling Day is celebrated on September 25 and explains how Maria Droujkova and Sue VanHattum developed the observance.

Michigan Indian Day

Michigan commemorative day established by state law

Michigan Department of Civil Rights

National Comic Book Day

United States / informal comics-reading and publishing observance

Penguin Random House Higher Education published consecutive annual observance features identifying September 25 as National Comic Book Day.

National Cooking Day™

United States / PotsandPans.com and Meyer Corporation-created home-cooking observance

Meyer Corporation’s creator-provided 2016 release says PotsandPans.com created National Cooking Day and identifies September 25 as the observance date.

National Food Service Workers Day

United States / informal food-service worker appreciation observance

The International Dairy Deli Bakery Association’s 2026 industry calendar lists National Food Service Workers Day on September 25, with additional industry/union recognition on that date.

National Psychotherapy Day

United States / Psychotherapy Foundation-origin professional and public-awareness observance

The launch announcement identifies September 25, 2012 as the first National Psychotherapy Day, sponsored by GoodTherapy.org and the Psychotherapy Foundation; later professional records cont…

National YogaFit Day

United States / YogaFit Worldwide-created yoga-community observance

YogaFit’s current official social presence celebrates National YogaFit Day on September 25, while National Day Archives identifies YogaFit Worldwide as the founder in 2019 and records Septe…

Native American Day (California)

California / state educational observance

California’s Department of Education quotes Education Code section 37220.7 and identifies the fourth Friday in September as Native American Day, including 25 September 2026.

Research Administrator Day / International Research Administrators Day

Research administration profession recognition

University of Michigan research administration materials identify 25 September as National Research Administrator Day and attribute its creation to NCURA in 2015; NCURA regional programming…

Save the Koala Day

Australia / Australian Koala Foundation campaign

The Australian Koala Foundation lists Save the Koala Day as the last Friday in September and identifies September 25 for the 2026 observance.

Sport Purple for Platelets Day

Global / Platelet Disorder Support Association awareness campaign

PDSA states that Sport Purple for Platelets Day is recognized on the last Friday of every September as part of platelet-disorder awareness work.

Sukkot

Jewish festival; dates follow the Hebrew calendar and observance timing begins at sundown

Bank of Israel’s 2026 calendar records the eve and first day of Sukkot; Jewish-calendar timing varies by year.

Tag des Deutschen Butterbrotes (German Butterbrot Day)

Germany / German bread-and-butter food-culture campaign tradition

Germany’s Deutsche Lebensmittelbuch-Kommission states that Tag des Deutschen Butterbrotes has been celebrated since 1999 on the last Friday in September; WDR independently documents the CMA…

World Dream Day

Global organizer-led participatory observance

World Dream Day’s official site states that the observance is held annually on 25 September and its current 2026 page describes the campaign’s focus on ideas, goals and dreams.

World Pharmacists Day

Organizer-backed international observance

International Pharmaceutical Federation (FIP)

European Day of Languages

Council of Europe language-learning and linguistic-diversity observance

Council of Europe; annual observance following the 2001 European Year of Languages

Fish Amnesty Day

PETA / animal-rights campaign

PETA states that it created Fish Amnesty Day in 1997 and marks it on the fourth Saturday in September.

HR Professionals Day

Workplace/professional recognition observance

Hofstra University and employer professional communications identify September 26 as HR/Human Resource Professional Day.

International Day for the Total Elimination of Nuclear Weapons

United Nations / international observance

A/RES/68/32

International Rabbit Day

International / rabbit welfare awareness

World Animal Protection describes International Rabbit Day as occurring on the fourth Saturday of September and gives 26 September for 2026.

Mesothelioma Awareness Day

United States-centered organizer campaign with state/local proclamations

The Mesothelioma Applied Research Foundation states that Mesothelioma Awareness Day takes place annually on September 26 and was established by its community in 2004.

National Dumpling Day

United States / TMI Food Group-founded food observance

National Day Calendar records September 26 as National Dumpling Day and says TMI Food Group submitted the observance in 2015.

National Ghost Hunting Day

International / National Ghost Hunting Day paranormal-community event

The official National Ghost Hunting Day site states the event was established in 2016 and is held on the last Saturday of September.

National Hunting and Fishing Day

United States — conservation and outdoor heritage observance

U.S. Fish & Wildlife Service states Congress established the observance in 1972 and it is celebrated on the fourth Saturday in September

National Key Lime Pie Day

United States / informal culinary observance acknowledged by Publix

Publix corporate material explicitly identifies September 26 as National Key Lime Pie Day.

National Law Enforcement Suicide Awareness Day

United States / law-enforcement mental-health awareness

FBI outreach material identifies September 26 as National Law Enforcement Suicide Awareness Day; Blue H.E.L.P. states the day was created to remember officers lost to suicide and reduce sti…

National Public Lands Day

United States — nationwide public-lands volunteer observance

National Park Service current 2026 observance page; led by NEEF in partnership with NPS and federal agencies

National Seat Check Saturday

United States / NHTSA child-passenger-safety campaign

NHTSA's Traffic Safety Marketing portal lists National Seat Check Saturday as September 26, 2026 and publishes different dates for 2027-2029, so target-year refresh is required.

National Situational Awareness Day

United States / Pretty Loaded-origin personal-safety awareness campaign

Pretty Loaded states it submitted the observance in 2015 and that National Situational Awareness Day is celebrated every year on September 26.

Save Your Photos Day

Informal photo-preservation awareness observance

Institutional and calendar references place Save Your Photos Day on the last Saturday in September; the recurrence yields 26 September in 2026.

World’s Largest Pet Walk

Pet Partners / annual fundraising and community-walk campaign

Pet Partners lists the 2026 World’s Largest Pet Walk for 26 September and describes it as its signature annual fundraising walk.

Fête de la Communauté française

Fédération Wallonie-Bruxelles / French Community of Belgium

The Fédération Wallonie-Bruxelles 2026–2027 official calendar lists the Fête de la Communauté française on 27 September 2026.

Gold Star Mother's and Family's Day

United States / Gold Star family remembrance

The 2025 presidential proclamation uses Gold Star Mother's and Family's Day; 36 U.S.C. §111 separately designates the last Sunday in September as Gold Star Mother's Day.

Independence Day of Turkmenistan

Turkmenistan

The Ministry of Foreign Affairs states that 27 September is celebrated as Independence Day in Turkmenistan and lists it among public holidays.

National Chocolate Milk Day

Informal food-calendar usage documented by Association of Nutrition & Foodservice Professionals chapter material

Two Association of Nutrition & Foodservice Professionals chapter calendars from different publication years list National Chocolate Milk Day on 27 September.

National Corned Beef Hash Day

Informal food-calendar usage documented by Association of Nutrition & Foodservice Professionals chapter material

Two Association of Nutrition & Foodservice Professionals chapter calendars from different publication years list National Corned Beef Hash Day on 27 September.

World Day of Migrants and Refugees

Catholic Church / 112th edition

The Holy See announced that the 112th World Day of Migrants and Refugees will be celebrated on Sunday, 27 September 2026.

World Rivers Day

international river-awareness and stewardship observance

World Rivers Day organizers; global initiative launched in 2005 alongside the UN Water for Life Decade

World Tourism Day

UN Tourism / United Nations / international observance

UN Tourism observance

Czech Statehood Day

Czech Republic / state holiday

Current Czech law lists 28 September as Czech Statehood Day; the page’s St. Wenceslas wording is a search-facing alias for the statehood observance.

Family Day — A Day to Eat Dinner With Your Children

United States / family-dinner campaign associated with CASA research and participating family-prevention organizations

University of Hawaiʻi material describes Family Day as an annual event launched in 2001, developed from research by the National Center on Addiction and Substance Abuse at Columbia Universi…

Fish Tank Floorshow Night

United States / creator-defined informal Wellcat observance

Wellcat Holidays lists Fish Tank Floorshow Night on September 28 and identifies Thomas and Ruth Roy as the holiday creators.

International Day for Universal Access to Information

UNESCO / United Nations / international observance

A/RES/74/5

International Right to Know Day

Access-to-information and transparency advocacy; historically used by OSCE and civil-society partners

The OSCE Mission to Serbia documented International Right to Know Day on 28 September in partnership with public institutions, UNDP, journalists and transparency groups.

National Good Neighbor Day

United States / community observance and historical congressional recognition context

The current National Good Neighbor Day organizer uses September 28. Historical congressional materials contain date-specific and fourth-Sunday recognition formulations, so the record does n…

National North Carolina Day

United States / National Day Calendar National State Days series — North Carolina

National Day Calendar lists National North Carolina Day on 28 September. The U.S. Senate records North Carolina’s admission/statehood date as 21 November 1789. The two dates are deliberatel…

National Self Awareness Day

United States / informal self-awareness observance

National Today gives National Self Awareness Day an every-September-28 recurrence, and EventGuide independently lists it every September 28.

Strawberry Cream Pie Day

Informal food-calendar usage documented by Association of Nutrition & Foodservice Professionals chapter material

Two Association of Nutrition & Foodservice Professionals chapter calendars from different publication years list Strawberry Cream Pie Day on 28 September.

World Rabies Day

World Health Organization-supported observance

WHO global health observance

Anniversary of the Victory of the Battle of Boquerón

Paraguay / Boquerón historical civic commemoration

The Government of Boquerón commemorates 29 September as the anniversary of the victory of the Battle of Boquerón and honors the heroes of the Chaco War.

International Day of Awareness of Food Loss and Waste

FAO / UNEP / United Nations / international observance

A/RES/74/209

National Coffee Day

United States / coffee-industry observance

The National Coffee Association repeatedly marks National Coffee Day around September 29, including its 2025 research release issued in advance of the September 29 observance and subsequent…

National Police Memorial Day

United Kingdom

The National Police Memorial Day organization states that the service is held on the nearest Sunday to 29 September and lists the 2026 service for Sunday 27 September in Belfast.

National Police Remembrance Day

Australia

Victoria Police’s official memorial page states that National Police Remembrance Day is observed on 29 September and provides the 2026 service date.

National Silent Movie Day

International / film-preservation observance organized by Silent Movie Day

Silent Movie Day’s organizers state that the annual celebration is held September 29 to promote silent-film exhibition and preservation.

VFW Day

Veterans of Foreign Wars / United States veterans-service organization

The Veterans of Foreign Wars commemorates VFW Day on September 29 in connection with the organization’s founding and continuing service

World Heart Day

World Heart Federation global campaign

Fiestas de San Jerónimo in Masaya

Masaya, Nicaragua patronal and cultural festival

Visit Nicaragua documents the San Jerónimo festivities in Masaya, including the major 30 September procession and later folkloric events.

Independence Day

Botswana

Government of Botswana material identifies 30 September as Botswana Independence Day.

International Podcast Day™

International Podcast Day / global organizer-led observance

The official International Podcast Day site identifies 30 September as International Podcast Day and explains that the event was rebranded from National Podcast Day in 2015.

International Translation Day

United Nations international observance

A/RES/71/288

National Extra Virgin Olive Oil Day

United States / informal food observance

Cleveland Clinic News Service identifies September 30 as National Extra Virgin Olive Oil Day, and current observance calendars repeat the same Gregorian date.

National Hot Mulled Cider Day

Informal food-calendar usage documented by Association of Nutrition & Foodservice Professionals chapter material

Two Association of Nutrition & Foodservice Professionals chapter calendars from different publication years list National Hot Mulled Cider Day on 30 September.

National Love People Day

United States / Lifeline Church-created community observance

Lifeline Church’s lead-pastor biography states that he and church leaders founded National Love People Day in 2017 and that it is celebrated annually on September 30.

National Puppy Mill Survivor Day

United States / Bailing Out Benji-created puppy-mill awareness day

Bailing Out Benji states it created National Puppy Mill Survivor Day in September 2021 and that it takes place on September 30 each calendar year.

National Women’s Health & Fitness Day

United States / Health Information Resource Center organizer-led event

The official FitnessDay site states that National Women’s Health & Fitness Day is always held on the last Wednesday in September and is organized by the Health Information Resource Center.

Orange Shirt Day

Canada / Indigenous-led remembrance and awareness observance

The Government of Canada states that 30 September marks both the National Day for Truth and Reconciliation and Orange Shirt Day, which began as an Indigenous-led grassroots commemorative da…