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Evergreen date guide

What is celebrated on September 18?

For 2026, these source-backed observances resolve to Friday, September 18. Recurring rules can move in another year, so each record keeps its own date logic.

Date authority profile

What this date contains

13 unique authority records

The list is deduplicated at the public entity layer while retaining all research provenance behind each page.

0 stable or rule-calculated

0 fixed annual and 0 reusable rule-based records can be placed without inventing a new date.

0 edition-specific

Edition-specific dates appear only when the requested year matches the verified edition; variable and historical records remain gated.

8 explicit country-scope records

Country scope stays attached to the underlying record instead of being generalized into a worldwide observance.

1 reviewed in-depth guides

These entities add reviewed meaning, history, activities, facts and FAQs without rewriting the authority facts.

Reviewed depth

Other in-depth guides on September 18

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Topics represented on September 18

All topics →
Community, Causes & Advocacy 2Celebrations & Social 2Health, Wellness & Awareness 2Animals, Nature & Environment 2Civic, Remembrance & History 1Food, Drink & Hospitality 1Relationships & Family 1Workplace, Professions & Appreciation 1
13 date-resolved records

All observances on this date

Source-backedFixed Annual

Chile Independence Day

18 September · Chile

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

Source-backedRule Based Annual

International Grenache Day

Third Friday of September; 18 September in 2026 · 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…

Source-backedFixed Annual

National Cheeseburger Day

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

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

Source-backedRule Based Annual

National Concussion Awareness Day®

Third Friday of September; 18 September 2026 · 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…

Source-backedFixed Annual

National First Love Day

18 September · 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.

Source-backedFixed Annual

National HIV/AIDS and Aging Awareness Day

18 September each year · 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.

Source-backedRule Based Annual

National POW/MIA Recognition Day

Third Friday in September annually · 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…

Source-backedFixed Annual

National Report Kickback Fraud Day

18 September · 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.

Source-backedFixed Annual

National Respect Day

18 September · 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…

Source-backedFixed Annual

Read an Ebook Day

18 September annually · OverDrive / organizer-led reading campaign

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

Source-backedFixed Annual

World Bamboo Day

18 September · Organizer-backed global sustainability observance

World Bamboo Organization (WBO)

Source-backedFixed Annual

World Water Monitoring Day

18 September · international water-quality awareness and citizen-action observance

EarthEcho International / Water Challenge program

How this date is built

This page is assembled from verified fixed dates, reusable recurrence rules, and target-year records whose edition matches 2026. Variable, historical or unresolved records are not silently forced onto this date.

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