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Evergreen date guide

What is celebrated on May 20?

For 2026, these source-backed observances resolve to Wednesday, May 20. 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.

6 explicit country-scope records

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

2 reviewed in-depth guides

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

Curated global anchors

Major global guides on May 20

See the collection →

A reviewed starting point drawn from prominent global observances with strong institutional or organizer provenance. Selection does not change each record’s official status or scope.

Source-backedFixed AnnualIn-depth guide

World Metrology Day

20 May · UNESCO international day

UNESCO international day

Reviewed depth

Other in-depth guides on May 20

Source-backedFixed AnnualIn-depth guide

World Bee Day

20 May · FAO / United Nations / international observance

A/RES/72/211

Explore the mix

Topics represented on May 20

All topics →
Workplace, Professions & Appreciation 3Civic, Remembrance & History 3Health, Wellness & Awareness 2Animals, Nature & Environment 2Community, Causes & Advocacy 1Arts, Entertainment & Lifestyle 1
12 date-resolved records

All observances on this date

Source-backedFixed Annual

Clinical Trials Day

20 May annually · International clinical-research professional community; coordinated by ACRP and sector partners

The Association of Clinical Research Professionals states Clinical Trials Day is observed annually on 20 May and documents its 2026 recognition initiative.

Source-backedFixed Annual

Independence Restoration Day

20 May · Timor-Leste / national public holiday and independence commemoration

Timor-Leste government material identifies 20 May as Independence Restoration Day and as a national holiday under the country’s public-holiday framework.

Source-backedFixed Annual

National Day of Cameroon

20 May; current government observance confirmed · Cameroon / National Day

The Presidency of Cameroon identifies May 20 as National Day and links the observance to the 1972 referendum establishing the Unitary State.

Source-backedRule Based Annual

National Employee Health and Fitness Day

Third Wednesday of May (20 May in 2026) · United States / National Association for Health & Fitness workplace-wellness observance

The U.S. President’s Council historical record identifies the NAHF activity and states that National Employee Health and Fitness Day is held on the third Wednesday of May.

Source-backedEdition Specific

National Numeracy Day

Annual May date announced by National Numeracy (20 May in 2026) · United Kingdom numeracy-awareness campaign

National Numeracy; campaign launched in 2018

Source-backedFixed Annual

National Rescue Dog Day

20 May · United States-origin / creator-led rescue-dog awareness observance

The National Rescue Dog Day site states that the observance is held annually on May 20 and was founded in 2018 by Lisa Wiehebrink/Tails That Teach.

Source-backedFixed Annual

National Women in Aerospace Day

20 May; congressional recognition effort documented for 2025–2026 · United States / congressional recognition context

H. Res. 941 was introduced to recognize May 20 as National Women in Aerospace Day, and the Congressional Record documents a May 20, 2026 House recognition statement.

Source-backedFixed Annual

Restoration of Independence Day

20 May · Timor-Leste

The Government of Timor-Leste’s 2026 commemoration material marks 20 May 2026 as the 24th anniversary of the Restoration of Independence. The published search title is treated as a common-l…

Source-backedFixed Annual

World AUTOimmune & AUTOinflammatory Arthritis Day

20 May annually · Global / International Foundation for Autoimmune & Autoinflammatory Arthritis campaign

AiArthritis identifies 20 May as World AUTOimmune & AUTOinflammatory Arthritis Day and says the awareness day was established in 2012.

Source-backedFixed AnnualIn-depth guide

World Bee Day

20 May · FAO / United Nations / international observance

A/RES/72/211

Source-backedFixed AnnualIn-depth guide

World Metrology Day

20 May · UNESCO international day

UNESCO international day

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.

Read the methodology →