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Evergreen date guide

What is celebrated on September 11?

See the observances and verified observance-history milestones attached to September 11. 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.

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 11

Source-backedFixed AnnualIn-depth guide

National Make Your Bed Day

11 September · United States / informal lifestyle observance

National Day Calendar consistently places National Make Your Bed Day on September 11 and explicitly notes that its origin is unidentified.

Source-backedFixed AnnualIn-depth guide

Patriot Day

11 September · United States national day of remembrance

U.S. Government Publishing Office

Explore the mix

Topics represented on September 11

All topics →
Celebrations & Social 1Civic, Remembrance & History 1
2 observances

All observances on this date

Source-backedFixed AnnualIn-depth guide

National Make Your Bed Day

11 September · United States / informal lifestyle observance

National Day Calendar consistently places National Make Your Bed Day on September 11 and explicitly notes that its origin is unidentified.

Source-backedFixed AnnualIn-depth guide

Patriot Day

11 September · United States national day of remembrance

U.S. Government Publishing Office

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 →