Source-backedFixed Annual
10 April · Invention-history anniversary / Walter Hunt U.S. safety-pin patent
The original U.S. Patent No. 6,281 text identifies Walter Hunt’s dress-pin invention and dates the patent 10 April 1849; Smithsonian collections also identify Hunt with the safety-pin inven…
Source-backedEdition Specific
27 March in 2026 · United Kingdom / Brain Tumour Research fundraising campaign
Brain Tumour Research’s 2026 campaign page sets Wear A Hat Day for Friday 27 March 2026 and identifies it as the charity’s major fundraising event.
Source-backedVariable Custom
Labor Day period; current schedule must be rechecked · Brooklyn, New York, United States
WIADCA is the primary organizer for the West Indian American Day Carnival and its parade/carnival programme
Source-backedFixed Annual
15 January annually; 15 January 2026 marked Wikipedia’s 25th birthday · Wikimedia community / Wikipedia founding anniversary
Wikimedia’s official Meta-Wiki 25th-birthday calendar documents celebrations on 15 January 2026, the anniversary of Wikipedia’s launch.
Source-backedHistorical Legacy
2 February? No — specifically 4 February 2024 (2/4/24); one-time proclamation context · San Francisco/Giants civic and baseball tribute to Willie Mays
The San Francisco Giants document Mayor London Breed’s proclamation of 4 February 2024 (2/4/24) as Willie Mays Day.
Source-backedEdition Specific
Annual; 9–11 February 2027 is the next published edition · Annual agricultural trade show in Tulare, California
International Agri-Center / World Ag Expo
Source-backedFixed Annual
18 April · Organizer-backed international observance
International Amateur Radio Union (IARU)
Source-backedRule Based Annual
First Monday of October · Organizer-backed global architecture observance
International Union of Architects (UIA)
Source-backedFixed AnnualIn-depth guide
15 April · UNESCO world day
Source-backedFixed Annual
31 March · data-backup and digital-preservation awareness observance
World Backup Day initiative
Source-backedFixed Annual
5 July · Organizer-backed global sport observance
Badminton World Federation (BWF)
Source-backedEdition Specific
Annual global dance event; 12 November in the 2025 edition · International ballet-company collaboration / global dance audiences
The official World Ballet Day site describes the event as a global celebration of dance and publishes the participating companies and edition date
Source-backedFixed AnnualIn-depth guide
21 December · United Nations / international observance
A/RES/77/324
Source-backedRule Based Annual
Second Saturday in May · International / belly-dance community observance
A Bayfield County, Wisconsin 2026 event page explicitly states that the second Saturday in May is World Belly Dance Day; dance-community historical references attribute the concept to Lydia…
Source-backedFixed AnnualIn-depth guide
3 June · United Nations / international observance
A/RES/72/272
Source-backedFixed AnnualIn-depth guide
23 April · UNESCO international observance
UNESCO 28 C/Resolution 3.18
Source-backedFixed Annual
23 April annually · United Kingdom / The Reading Agency campaign
The official World Book Night site states that World Book Night is celebrated on 23 April and is run by The Reading Agency.
Source-backedFixed Annual
26 April · International / creator-led burlesque community observance
The official World Burlesque Day site says the initiative launched in 2020 and is celebrated annually on 26 April.
Source-backedRule Based Annual
Second Wednesday of August; 12 August 2026 · International calligraphy community / founder and museum context
A calligraphy museum account states that World Calligraphy Day was established in 2017 by Manuscript Pen Company with the Pen Museum and is marked on the second Wednesday of August.
Source-backedRule Based Annual
First Saturday of October · International / card-making community observance
The World Card Making Day official site defines the observance as the first Saturday of each October for the worldwide card-making community.
Source-backedFixed AnnualIn-depth guide
20 July · United Nations / international observance
A/RES/74/22
Source-backedFixed Annual
20 July · United Nations international observance / longstanding international chess observance
United Nations General Assembly
Source-backedRule Based Annual
Third Saturday of April annually; 18 April 2026 · Global / Fédération Mondiale du Cirque observance
The Fédération Mondiale du Cirque identifies World Circus Day as the third Saturday in April each year and gives 18 April for 2026.
Source-backedFixed AnnualIn-depth guide
29 October · UNESCO international day
Designated by UNESCO Member States; first celebrated in 2024
Source-backedFixed AnnualIn-depth guide
21 April · United Nations / international observance
A/RES/71/284
Source-backedEdition Specific
Organizer-set scientific event; first edition held in October 2020 and second on 20 October 2021 · Synthego-organized CRISPR scientific symposium / genome-engineering community
Synthego documents the first World CRISPR Day in October 2020 and a second virtual event on 20 October 2021. The evidence supports an organizer-run scientific event, not a universal fixed a…
Source-backedFixed AnnualIn-depth guide
24 January · UNESCO world day
Source-backedFixed AnnualIn-depth guide
27 October · UNESCO / international observance
UNESCO 33 C/Resolution 5
Source-backedFixed AnnualIn-depth guide
5 November · UNESCO international day
Proclaimed by UNESCO in 2015
Source-backedFixed Annual
20 March annually · Global / ASSITEJ International observance
ASSITEJ International identifies 20 March as the annual World Day of Theatre for Children and Young People.
Source-backedFixed Annual
17 July annually · Emojipedia / global organizer-led observance
Emojipedia, whose founder created World Emoji Day, identifies the observance as taking place on 17 July.
Source-backedFixed AnnualIn-depth guide
19 May · United Nations / international observance
A/RES/78/310
Source-backedRule Based Annual
Third Saturday of May · international fiddle-music celebration
World Fiddle Day campaign; recurrence and history corroborated in Canada’s National Fiddling Day Act
Source-backedFixed AnnualIn-depth guide
25 May · United Nations / international observance
A/RES/78/281
Source-backedFixed Annual
22 May · international goth-culture celebration
World Goth Day organizers
Source-backedFixed Annual
21 June annually · International Hydrographic Organization / global observance
The International Hydrographic Organization states that World Hydrography Day is celebrated on 21 June; its 2026 page confirms 21 June 2026.
Source-backedFixed Annual
29 June · Organizer-backed international design observance
World Design Organization (WDO)
Source-backedFixed AnnualIn-depth guide
26 April · WIPO / United Nations / international observance
WIPO observance
Source-backedFixed Annual
28 October · Organizer-backed worldwide sport observance
International Judo Federation (IJF)
Source-backedRule Based Annual
Saturday closest to 17 June · global juggling art and community observance
International Jugglers' Association
Source-backedFixed AnnualIn-depth guide
7 July · United Nations / international observance
A/RES/78/312
Source-backedRule Based Annual
First Sunday of May · international laughter and positive-community observance
Laughter Yoga International
Source-backedFixed Annual
1 September annually · 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.
Source-backedFixed Annual
26 May · global Lindy Hop dance, history and community observance
Frankie Manning Foundation
Source-backedFixed AnnualIn-depth guide
14 January · UNESCO international day
Proclaimed by UNESCO in 2019
Source-backedFixed AnnualIn-depth guide
21 December · United Nations / international observance
A/RES/79/137
Source-backedFixed AnnualIn-depth guide
20 May · UNESCO international day
UNESCO international day
Source-backedFixed Annual
21 September · 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.
Source-backedFixed Annual
21 June · International biking community / Association of Biking Community India event
The Association of Biking Community India states that its flagship World Motorcycle Day is celebrated every year on June 21.
Source-backedFixed Annual
17 April annually · Ford / Mustang heritage celebration
Ford’s media materials call 17 April World Mustang Day and tie the date to the Mustang’s public debut in 1964.
Source-backedRule Based AnnualIn-depth guide
Week of 13 October · UNESCO international week
Proclaimed at UNESCO’s 41st General Conference (2021)
Source-backedHistorical Legacy
Last held 17–23 May 2023; World Orienteering Week replaced it from 2024 · International Orienteering Federation / historical global development initiative
The International Orienteering Federation states that the seventh and last World Orienteering Day was organized in May 2023 and that World Orienteering Week began in 2024.
Source-backedRule Based AnnualIn-depth guide
Third Thursday of November · UNESCO international day
Proclaimed by UNESCO General Conference in 2005
Source-backedFixed Annual
19 August annually; 19 August 2026 confirmed · WorldPhotographyDay.com / global organizer campaign
The event organizer describes World Photography Day as an annual worldwide celebration on 19 August and confirms Wednesday, 19 August 2026.
Source-backedFixed AnnualIn-depth guide
21 March · UNESCO international observance
UNESCO 30 C/Resolution 29
Source-backedFixed AnnualIn-depth guide
5 May · UNESCO / international observance
UNESCO 40 C/Resolution 70 (formal adopted act; 40 C/75 is a separate General Conference document identifier)
Source-backedFixed AnnualIn-depth guide
9 October · UPU / United Nations / international observance
UPU/1969/Res.C.11
Source-backedEdition Specific
21 March; Puppeteers of America held its 2026 online celebration on 22 March · Puppeteers of America / North American puppetry community
Puppeteers of America states that it officially merged National Day of Puppetry with World Puppetry Day, each March 21; its 2026 online celebration was scheduled for Sunday, 22 March.
Source-backedFixed Annual
21 March · Organizer-backed international observance
Union Internationale de la Marionnette (UNIMA)
Source-backedFixed AnnualIn-depth guide
13 February · UNESCO / United Nations / international observance
A/RES/67/124
Source-backedRule Based Annual
First Wednesday of February annually · LitWorld / global literacy campaign
LitWorld states that World Read Aloud Day is celebrated on the first Wednesday of every February.
Source-backedVariable Custom
Annual FIS snow-sports initiative; edition date is announced for each campaign · International Ski and Snowboard Federation (FIS) / global snow-sports participation
FIS presents World Snow Day as an international initiative designed to introduce children and families to snow activities
Source-backedFixed Annual
13 June · international softball participation and appreciation observance
World Baseball Softball Confederation (WBSC)
Source-backedFixed Annual
14 February · organizer-led sound, meditation and wellness observance
World Sound Healing Day / Healing Sounds organizers
Source-backedFixed AnnualIn-depth guide
4–10 October · United Nations international week
A/RES/54/68
Source-backedFixed Annual
15 March · global public-speaking and ideas-sharing observance
World Speech Day organization
Source-backedFixed Annual
2 July annually · International Sports Press Association (AIPS) / professional observance
AIPS states that 2 July each year has been designated World Sports Journalists Day to mark the association’s foundation.
Source-backedFixed AnnualIn-depth guide
11 August · United Nations / international observance
A/RES/77/316
Source-backedFixed Annual
20 March annually · International storytelling and cultural observance
A current 2026 Federal Ministry of Culture and Sports page identifies 20 March as World Storytelling Day and describes storytelling’s cultural role.
Source-backedFixed Annual
23 April · Organizer-backed global sport observance
ITTF Foundation
Source-backedRule Based Annual
Last Saturday of April · global Tai Chi and Qigong education and participation observance
WorldTaiChiDay.org / HPL Institute
Source-backedFixed AnnualIn-depth guide
17 May · ITU / United Nations / international observance
A/RES/60/252
