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Evergreen date guide

What is celebrated on August 17?

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

Date authority profile

What this date contains

7 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.

0 reviewed in-depth guides

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

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Topics represented on August 17

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Civic, Remembrance & History 5Workplace, Professions & Appreciation 2
7 date-resolved records

All observances on this date

Source-backedFixed Annual

Black Cat Appreciation Day

17 August · United States / animal-welfare and adoption-awareness observance

UPI reports that Wayne H. Morris started Black Cat Appreciation Day in 2011 and gives the date as August 17; ASPCA independently recognizes August 17 as the observance date.

Source-backedFixed Annual

Fête nationale / Independence anniversary of Gabon

17 August annually; 66th anniversary in 2026 · Gabon / national independence observance

The Presidency of Gabon documented the country’s national celebration on 17 August 2026 as the 66th anniversary of accession to international sovereignty.

Source-backedFixed Annual

Independence Day / Proclamation anniversary

17 August · Indonesia

Indonesia’s State Secretariat announced the 2026 Independence Month agenda and 17 August 2026 ceremony for the 81st anniversary of the Proclamation of Independence.

Source-backedFixed Annual

National Massachusetts Day

17 August · United States / National Day Calendar National State Days series — Massachusetts

National Day Calendar lists National Massachusetts Day on 17 August. The U.S. Senate records Massachusetts’s admission/statehood date as 6 February 1788. The two dates are deliberately kept…

Source-backedFixed Annual

National Workers’ Comp Adjuster Day

17 August · United States / Centre for Neuro Skills-created professional appreciation observance

National Day Archives records August 17 of each calendar year and identifies the Centre for Neuro Skills as the creator in July 2021.

Source-backedFixed Annual

Unification of Prekmurje Slovenes with the Mother Nation

17 August · Slovenia / national holiday that is not work-free

Slovenia’s government lists 17 August as Unification of Prekmurje Slovenes with the Mother Nation and explicitly identifies it among national holidays that are not work-free days.

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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