Evergreen date guide

What is celebrated on August 20?

See the observances and verified observance-history milestones attached to August 20. Each observance keeps its own source and date details.

Verified history

On this date in observance history

Today in history →

Selected observance milestones connected to this date, based on reviewed sources.

2011

First observance

International Geocaching Day

Geocaching HQ identifies August 20, 2011 as the first International Geocaching Day.

2008

Later action

Philippine-British Friendship Day

Changed the recurring Philippine-British Friendship Day date from December 7 to October 20, beginning in 2008.

1994

Institutional decision

Day of the State Flag of the Russian Federation

Current government material dates Decree No. 1714 to August 20, 1994.

About this date

What this date contains

3 observances

Each observance is shown once in this view, with its own source and scope details available on the guide page.

0 repeat predictably

0 use a fixed annual date and 0 follow a reusable calendar rule.

0 are edition-specific

These dates are shown only for the year or edition that has been confirmed.

3 have a country-specific scope

Country-specific observances are not presented as worldwide events.

3 have in-depth guides

These pages include reviewed meaning, history, activities, facts and FAQs.

Reviewed depth

Other in-depth guides on August 20

Source-backedFixed AnnualIn-depth guide

20 August — celebration of the founding of the State / Saint Stephen’s Day

20 August · Hungary / national and official state holiday

Hungary’s Fundamental Law names 20 August as a national holiday commemorating the foundation of the state and King Saint Stephen and identifies it as the official state holiday; current Hun…

Source-backedFixed AnnualIn-depth guide

Anniversary of the Revolution of the King and the People

20 August annually · Morocco / national holiday calendar

Morocco’s official national-holiday page lists 20 August as the Anniversary of the Revolution of the King and the People; royal materials provide the national historical framing.

Source-backedFixed AnnualIn-depth guide

National Radio Day

20 August · United States / unofficial radio appreciation observance acknowledged by Smithsonian institutions

August 20 is strongly institutionally corroborated, while the current National Radio Day organizer explicitly states that there is no one authoritative source for the observance’s origin; c…

Explore the mix

Topics represented on August 20

All topics →

Civic, Remembrance & History 2 Arts, Entertainment & Lifestyle 1

3 observances

All observances on this date

Source-backedFixed AnnualIn-depth guide

20 August — celebration of the founding of the State / Saint Stephen’s Day

20 August · Hungary / national and official state holiday

Hungary’s Fundamental Law names 20 August as a national holiday commemorating the foundation of the state and King Saint Stephen and identifies it as the official state holiday; current Hun…

Source-backedFixed AnnualIn-depth guide

Anniversary of the Revolution of the King and the People

20 August annually · Morocco / national holiday calendar

Morocco’s official national-holiday page lists 20 August as the Anniversary of the Revolution of the King and the People; royal materials provide the national historical framing.

Source-backedFixed AnnualIn-depth guide

National Radio Day

20 August · United States / unofficial radio appreciation observance acknowledged by Smithsonian institutions

August 20 is strongly institutionally corroborated, while the current National Radio Day organizer explicitly states that there is no one authoritative source for the observance’s origin; c…

How dates are selected

This page combines fixed annual dates, reusable calendar rules and year-specific dates confirmed for 2026. Variable or historical dates are included only when they are clearly supported.

Read the methodology →