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Evergreen date guide

What is celebrated on August 11?

For 2026, these source-backed observances resolve to Tuesday, August 11. Recurring rules can move in another year, so each record keeps its own date logic.

Date authority profile

What this date contains

6 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.

4 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 August 11

Source-backedFixed AnnualIn-depth guide

World Steelpan Day

11 August · United Nations / international observance

A/RES/77/316

Explore the mix

Topics represented on August 11

All topics →
Food, Drink & Hospitality 2Arts, Entertainment & Lifestyle 2Civic, Remembrance & History 1Animals, Nature & Environment 1
6 date-resolved records

All observances on this date

Source-backedFixed Annual

Independence Day

11 August annually · Chad / national independence commemoration

A current Chadian government ministry Independence Day message identifies 11 August as the anniversary of Chad’s independence in 1960.

Source-backedEdition Specific

Mountain Day (山の日)

11 August 2026 · Japan / statutory national holiday

Japan’s Cabinet Office lists Mountain Day on 11 August 2026 among the national holidays and describes its purpose as an opportunity to become familiar with mountains and appreciate their be…

Source-backedFixed Annual

National Fufu Day

11 August · International / informal West African food observance

National Today and Awareness Days independently place National Fufu Day on August 11. The alias International Fufu Day is retained because other current calendars use that wording for the s…

Source-backedFixed Annual

National Presidential Joke Day

11 August · United States / informal observance tied to Ronald Reagan’s 11 August 1984 microphone-check joke

National Day Calendar and National Day Archives both place the informal observance on 11 August and tie it to Ronald Reagan’s 11 August 1984 sound-check joke. The sources support the observ…

Source-backedFixed Annual

National Raspberry Bombe Day

11 August · United States / informal dessert observance

National Today and Days Of The Year independently place National Raspberry Bombe Day on August 11 each year.

Source-backedFixed AnnualIn-depth guide

World Steelpan Day

11 August · United Nations / international observance

A/RES/77/316

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.

Read the methodology →