Evergreen date guide

What is celebrated on April 18?

For 2026, these source-backed observances resolve to Saturday, April 18. Recurring rules can move in another year, so each record keeps its own date logic.

Date authority profile

What this date contains

12 unique authority records

The list is deduplicated at the public entity layer while retaining all research provenance behind each page.

0 stable or rule-calculated

0 fixed annual and 0 reusable rule-based records can be placed without inventing a new date.

0 edition-specific

Edition-specific dates appear only when the requested year matches the verified edition; variable and historical records remain gated.

5 explicit country-scope records

Country scope stays attached to the underlying record instead of being generalized into a worldwide observance.

1 reviewed in-depth guides

These entities add reviewed meaning, history, activities, facts and FAQs without rewriting the authority facts.

Reviewed depth

Other in-depth guides on April 18

Source-backedFixed AnnualIn-depth guide

International Day for Monuments and Sites

18 April · ICOMOS international heritage observance; concept adopted by UNESCO in 1983

International Council on Monuments and Sites (ICOMOS)

Explore the mix

Topics represented on April 18

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Arts, Entertainment & Lifestyle 6 Health, Wellness & Awareness 2 Workplace, Professions & Appreciation 2 Animals, Nature & Environment 1 Civic, Remembrance & History 1

12 date-resolved records

All observances on this date

Source-backedFixed Annual

Adult Autism Awareness Day

18 April · International / informal autism-awareness observance

National Today and Checkiday independently place Adult Autism Awareness Day on April 18 each year.

Source-backedEdition Specific

Healthy Kids Day®

18 April 2026 · United States / YMCA national family-wellbeing initiative

YMCA of the USA lists Healthy Kids Day 2026 on April 18 and identifies it as the Y’s national initiative for kids and families.

Source-backedFixed AnnualIn-depth guide

International Day for Monuments and Sites

18 April · ICOMOS international heritage observance; concept adopted by UNESCO in 1983

International Council on Monuments and Sites (ICOMOS)

Source-backedFixed Annual

National Animal Crackers Day

18 April · United States / informal food observance

National Day Archives lists the canonical plural National Animal Crackers Day on April 18; the public singular title is retained as an alias.

Source-backedFixed Annual

National Exercise Day

18 April · United States / informal registered wellness observance

National Day Archives lists National Exercise Day on April 18 and identifies Jeuse Saint-Fleur, DNP as its creator in 2020.

Source-backedEdition Specific

National Lineman Appreciation Day

18 April 2026 in H. Res. 1199 · United States / 2026 congressional resolution supporting recognition of electrical linemen

H. Res. 1199 in the 119th Congress expresses support for designating April 18, 2026 as National Lineman Appreciation Day. Because the cited congressional action is edition-specific, refresh…

Source-backedFixed Annual

National Newspaper Columnists Day

18 April · United States newspaper-columnist recognition observance

National Society of Newspaper Columnists

Source-backedFixed Annual

Pet Owner's Independence Day

18 April · United States / creator-defined informal Wellcat observance

The first-party Wellcat Holidays calendar lists Pet Owner's Independence Day on April 18 and identifies the collection as created by Thomas and Ruth Roy.

Source-backedEdition Specific

Record Store Day

18 April 2026 · Record Store Day / participating independent record shops

Record Store Day’s official UK site identifies Saturday 18 April 2026 as the 19th edition and describes the event as an annual April celebration.

Source-backedEdition Specific

Superman Day

18 April in the official 2026 edition · DC/Warner Bros. Discovery global Superman fan celebration

DC’s official 2026 announcement identifies 18 April 2026 as Superman Day and describes a global celebration of Superman, Supergirl and Krypto, linked to the anniversary of Superman’s debut.

Source-backedFixed Annual

World Amateur Radio Day

18 April · Organizer-backed international observance

International Amateur Radio Union (IARU)

Source-backedRule Based Annual

World Circus Day

Third Saturday of April annually; 18 April 2026 · Global / Fédération Mondiale du Cirque observance

The Fédération Mondiale du Cirque identifies World Circus Day as the third Saturday in April each year and gives 18 April for 2026.

How this date is built

This page is assembled from verified fixed dates, reusable recurrence rules, and target-year records whose edition matches 2026. Variable, historical or unresolved records are not silently forced onto this date.

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