Evergreen date guide

What is celebrated on September 10?

See the observances and verified observance-history milestones attached to September 10. 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.

2014

Later action

Día de la Raza / October 12 commemoration in Honduras

Unified and transferred the civic holidays of October 3, 12 and 21 into a combined tourism-oriented holiday period.

2014

Later action

Día de las Fuerzas Armadas de Honduras

The October 3, 12 and 21 civic holidays were consolidated/transferred for tourism scheduling; this is a work/closure scheduling layer, not a new Armed Forces Day identity.

2008

Institutional decision

Constitution Day of the Republic of Indonesia

The BPK legal database lists the decree’s stipulation and effective date as 10 September 2008.

2005

First observance

World Naked Gardening Day

The current WNGD history labels 10 September 2005 as the inaugural edition.

1978

First observance

National Grandparents Day

Proclamation 4580 designated Sunday, 10 September 1978 as National Grandparents Day before the recurring statutory framework.

About this date

What this date contains

2 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.

1 have a country-specific scope

Country-specific observances are not presented as worldwide events.

2 have in-depth guides

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

Reviewed depth

Other in-depth guides on September 10

Source-backedRule Based AnnualIn-depth guide

National School Picture Day

Second Thursday of September (10 September in 2026) · 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.

Source-backedRule Based AnnualIn-depth guide

R U OK?Day

Second Thursday in September (10 September 2026; 9 September 2027) · Australia suicide-prevention conversation and connection campaign

R U OK? states that the campaign was born in 2009 from Gavin Larkin’s work with Janina Nearn and that R U OK?Day is held on the second Thursday in September; the organization gives 9 Septem…

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Topics represented on September 10

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Arts, Entertainment & Lifestyle 1 Community, Causes & Advocacy 1

2 observances

All observances on this date

Source-backedRule Based AnnualIn-depth guide

National School Picture Day

Second Thursday of September (10 September in 2026) · 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.

Source-backedRule Based AnnualIn-depth guide

R U OK?Day

Second Thursday in September (10 September 2026; 9 September 2027) · Australia suicide-prevention conversation and connection campaign

R U OK? states that the campaign was born in 2009 from Gavin Larkin’s work with Janina Nearn and that R U OK?Day is held on the second Thursday in September; the organization gives 9 Septem…

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 →