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Evergreen date guide

What is celebrated on May 17?

For 2026, these source-backed observances resolve to Sunday, May 17. Recurring rules can move in another year, so each record keeps its own date logic.

Date authority profile

What this date contains

8 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.

2 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.

Curated global anchors

Major global guides on May 17

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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.

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Topics represented on May 17

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Civic, Remembrance & History 2Community, Causes & Advocacy 2Health, Wellness & Awareness 2Relationships & Family 1Arts, Entertainment & Lifestyle 1
8 date-resolved records

All observances on this date

Source-backedRule Based Annual

International AIDS Candlelight Memorial

Third Sunday in May; 17 May 2026 · Global Network of People Living with HIV / global memorial

The International AIDS Candlelight Memorial states that the memorial is held every third Sunday in May and has been observed since 1983 under coordination by GNP+.

Source-backedFixed Annual

International Child Helpline Day

17 May annually · Child Helpline International / global network observance

Child Helpline International identifies 17 May as International Child Helpline Day; its materials also document the observance’s network context.

Source-backedFixed Annual

National Idaho Day

17 May · United States / National Day Calendar National State Days series — Idaho

National Day Calendar lists National Idaho Day on 17 May. The U.S. Senate records Idaho’s admission/statehood date as 3 July 1890. The two dates are deliberately kept separate so the inform…

Source-backedRule Based Annual

National Take Your Parents to the Playground Day

Third Sunday in May · United States / PDPlay-created family/outdoor-play observance

PDPlay currently promotes the observance on the third Sunday in May, and National Day Calendar records the current recurrence while documenting PDPlay’s original 2009 creation.

Source-backedFixed Annual

World Hypertension Day

17 May · Organizer-backed international observance

World Hypertension League (WHL)

Source-backedFixed Annual

World NF Awareness Day

17 May annually · Children’s Tumor Foundation / global NF awareness campaign

The Children’s Tumor Foundation identifies 17 May as World NF Awareness Day and separately identifies 22 May for NF2-SWN awareness.

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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