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Evergreen date guide

What is celebrated on October 18?

See the observances and verified observance-history milestones attached to October 18. 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.

2021
First observance

Heroes and Foreparents Day

The Government states that Heroes’ and Forefathers Day was celebrated for the first time on October 18, 2021.

2017
Later action

Día de la Revolución de Mayo

Established the current statutory framework listing May 25 as an immovable national holiday named Día de la Revolución de Mayo.

2012
First observance

International ShakeOut Day

ShakeOut’s historical overview says a new global website was established for the October 18, 2012 ShakeOut so people in any other state or country could register and be counted in…

2012
Later action

International ShakeOut Day

A global registration site allowed participants outside established ShakeOut regions to join and be counted internationally.

2011
First observance

Health Care Assistant Day

The B.C. proclamation index lists Health Care Assistant Day on 18 October 2011, and the Registry calls 2011 the first official proclamation.

2011
Later action

Independence of Cuenca

Formalized awards/solemn-session activity around Cuenca’s foundation and November 3 independence celebrations.

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 October 18

Source-backedFixed AnnualIn-depth guide

Military Women’s Memorial anniversary

18 October anniversary of the 18 October 1997 dedication · Arlington, Virginia / Military Women’s Memorial institutional anniversary

The Military Women’s Memorial says the completed memorial was dedicated and opened on October 18, 1997, and first-party anniversary programming continues to mark October 18.

Source-backedFixed AnnualIn-depth guide

National Speak Up for Victims of Sexual Abuse Day

18 October · United States / creator-registered sexual-abuse awareness observance; survivor-centered public copy required

National Day Archives records October 18 annual recurrence and an October 2021 creation on behalf of Jack Nunnery; a New Jersey government DEIB calendar independently lists the date. RAINN…

Explore the mix

Topics represented on October 18

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Civic, Remembrance & History 2
2 observances

All observances on this date

Source-backedFixed AnnualIn-depth guide

Military Women’s Memorial anniversary

18 October anniversary of the 18 October 1997 dedication · Arlington, Virginia / Military Women’s Memorial institutional anniversary

The Military Women’s Memorial says the completed memorial was dedicated and opened on October 18, 1997, and first-party anniversary programming continues to mark October 18.

Source-backedFixed AnnualIn-depth guide

National Speak Up for Victims of Sexual Abuse Day

18 October · United States / creator-registered sexual-abuse awareness observance; survivor-centered public copy required

National Day Archives records October 18 annual recurrence and an October 2021 creation on behalf of Jack Nunnery; a New Jersey government DEIB calendar independently lists the date. RAINN…

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 →