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Evergreen date guide

What is celebrated on October 21?

See the observances and verified observance-history milestones attached to October 21. 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.

2010
Later action

Tartan Day

Established federal Canadian recognition of April 6 as Tartan Day.

1990
First observance

Apple Day

Common Ground says Apple Day was launched on 21 October 1990 and describes the first celebration at Covent Garden.

1960
First observance

Police Commemoration Day

PIB states that Police Commemoration Day has been celebrated across the country since 1960 following the January 1960 decision.

1944
First observance

Navy Day

Government historical material explicitly identifies 21 October 1944 as the first Navy Day celebration by the Royal Indian Navy.

About this date

What this date contains

11 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.

8 have a country-specific scope

Country-specific observances are not presented as worldwide events.

11 have in-depth guides

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

Reviewed depth

Other in-depth guides on October 21

Source-backedFixed AnnualIn-depth guide

Apple Day

21 October · United Kingdom / Common Ground apple-and-orchard calendar custom

Common Ground states that Apple Day was launched on 21 October 1990 and describes year-after-year local celebrations; its own canonical name is “Apple Day.”

Source-backedRule Based AnnualIn-depth guide

Breast Reconstruction Awareness Day USA (BRA Day)

Third Wednesday of October in ASPS annual practice; current edition date must be rechecked · United States / breast reconstruction awareness led by ASPS and The Plastic Surgery Foundation

ASPS documents the annual Breast Reconstruction Awareness Day USA (BRA Day) campaign and its educational focus on reconstruction choices after mastectomy or lumpectomy.

Source-backedFixed AnnualIn-depth guide

Día de las Fuerzas Armadas de Honduras

21 October annually · Honduras / national armed-forces commemoration

Official Honduran defense sources repeatedly identify October 21 as Armed Forces Day. Current legal material also preserves October 21 among the October civic holidays while later legislati…

Source-backedFixed AnnualIn-depth guide

Global Iodine Deficiency Disorders Prevention Day

21 October · India / public-health awareness; globally described awareness date

Government of India health material in 2009 and 2024 verifies annual October 21 observance and the World Iodine Deficiency Day alias; origin and first-observance fields remain unresolved.

Source-backedRule Based AnnualIn-depth guide

Hagfish Day

Third Wednesday in October (21 October in 2026) · International / WhaleTimes ocean-education initiative

WhaleTimes states that it created Hagfish Day in 2009 and its own materials specify the third Wednesday of every October.

Explore the mix

Topics represented on October 21

All topics →
Health, Wellness & Awareness 3Civic, Remembrance & History 3Workplace, Professions & Appreciation 2Food, Drink & Hospitality 1Animals, Nature & Environment 1Arts, Entertainment & Lifestyle 1
11 observances

All observances on this date

Source-backedFixed AnnualIn-depth guide

Apple Day

21 October · United Kingdom / Common Ground apple-and-orchard calendar custom

Common Ground states that Apple Day was launched on 21 October 1990 and describes year-after-year local celebrations; its own canonical name is “Apple Day.”

Source-backedRule Based AnnualIn-depth guide

Breast Reconstruction Awareness Day USA (BRA Day)

Third Wednesday of October in ASPS annual practice; current edition date must be rechecked · United States / breast reconstruction awareness led by ASPS and The Plastic Surgery Foundation

ASPS documents the annual Breast Reconstruction Awareness Day USA (BRA Day) campaign and its educational focus on reconstruction choices after mastectomy or lumpectomy.

Source-backedFixed AnnualIn-depth guide

Día de las Fuerzas Armadas de Honduras

21 October annually · Honduras / national armed-forces commemoration

Official Honduran defense sources repeatedly identify October 21 as Armed Forces Day. Current legal material also preserves October 21 among the October civic holidays while later legislati…

Source-backedFixed AnnualIn-depth guide

Global Iodine Deficiency Disorders Prevention Day

21 October · India / public-health awareness; globally described awareness date

Government of India health material in 2009 and 2024 verifies annual October 21 observance and the World Iodine Deficiency Day alias; origin and first-observance fields remain unresolved.

Source-backedRule Based AnnualIn-depth guide

Hagfish Day

Third Wednesday in October (21 October in 2026) · International / WhaleTimes ocean-education initiative

WhaleTimes states that it created Hagfish Day in 2009 and its own materials specify the third Wednesday of every October.

Source-backedFixed AnnualIn-depth guide

Honduran Armed Forces Day

21 October · Honduras / armed-forces commemoration

Honduran Armed Forces media identifies October 21 as Día de las Fuerzas Armadas and U.S. diplomatic holiday material also lists Honduran Armed Forces Day on October 21.

Source-backedFixed AnnualIn-depth guide

National Archives Day (Philippines)

21 October · Philippines / national archives and records observance

The National Archives of the Philippines states that Proclamation No. 660, s. 1995 declared October 21 of every year National Archives Day.

Source-backedRule Based AnnualIn-depth guide

National Support Your Local Chamber of Commerce Day

Third Wednesday in October (21 October in 2026) · United States / chamber-of-commerce recognition day

The U.S. Chamber of Commerce states that National Support Your Local Chamber of Commerce Day is celebrated each year on the third Wednesday in October.

Source-backedFixed AnnualIn-depth guide

Police Commemoration Day

21 October annually · India / national police remembrance observance

India’s Press Information Bureau documents Police Commemoration Day on 21 October and its connection to the 1959 Hot Springs police sacrifice.

Source-backedFixed AnnualIn-depth guide

Reptile Awareness Day

21 October · Animal welfare/conservation awareness / international usage

World Animal Protection states that Reptile Awareness Day is held every year on October 21 and uses World Reptile Day on the same campaign page; Arignar Anna Zoological Park also documents…

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 →