Evergreen date guide

What is celebrated on May 28?

For 2026, these source-backed observances resolve to Thursday, May 28. Recurring rules can move in another year, so each record keeps its own date logic.

Date authority profile

What this date contains

10 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.

4 explicit country-scope records

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

0 reviewed in-depth guides

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

Explore the mix

Topics represented on May 28

All topics →

Civic, Remembrance & History 3 Food, Drink & Hospitality 3 Health, Wellness & Awareness 2 Animals, Nature & Environment 1 Community, Causes & Advocacy 1

10 date-resolved records

All observances on this date

Source-backedFixed Annual

Independence Day

28 May annually · Azerbaijan / national holiday

Azerbaijan’s 2021 law names 28 May Independence Day, commemorating the 1918 declaration by the Azerbaijan Democratic Republic; the presidential holiday register uses the current Independenc…

Source-backedFixed Annual

International Burger Day

28 May · International / informal burger-food observance

National Today gives International Burger Day a fixed May 28 recurrence, while McDonald’s India independently marks International Burger Day in a company post published on May 28.

Source-backedFixed Annual

International Day of Action for Women’s Health

28 May annually; 2026 campaign on 28 May · International / WGNRR-coordinated health-rights campaign

The May 28 campaign site identifies 28 May as the International Day of Action for Women’s Health and states that the campaign is coordinated by the Women’s Global Network for Reproductive R…

Source-backedFixed Annual

Menstrual Hygiene Day

28 May · Organizer-backed global awareness and action day

WASH United / Menstrual Hygiene Day movement

Source-backedFixed Annual

National Day

28 May · Ethiopia

Australia’s Department of Foreign Affairs and Trade current National Days protocol register lists Ethiopia — National Day on 28 May.

Source-backedFixed Annual

National Flag Day / National Flag Days

28 May; National Flag Days run 28 May–12 June in current government guidance · Philippines / national flag commemoration

The Philippine Information Agency states that 28 May marks National Flag Day, declared by Presidential Proclamation No. 374 s. 1965, and that National Flag Days are observed from 28 May to…

Source-backedFixed Annual

National Hamburger Day

28 May · United States / informal food observance with repeated burger-brand usage

Wendy’s and BurgerFi first-party materials identify May 28 as National Hamburger Day in separate years.

Source-backedFixed Annual

Whooping Crane Day

28 May · North America / whooping-crane conservation awareness observance

Houston Zoo states that Whooping Crane Day takes place on May 28 each year, and the International Crane Foundation independently promoted Whooping Crane Day for May 28 in 2026.

Source-backedFixed Annual

World Hunger Day

28 May · global hunger awareness and action observance

World Hunger Day / The Hunger Project

Source-backedFixed Annual

World Passion Fruit Martini Day

28 May · International promotional/cocktail context / Funkin Cocktails-created observance

Current references place World Passion Fruit Martini Day on May 28 and attribute its establishment in 2021 to Funkin Cocktails.

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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