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Evergreen date guide

What is celebrated on August 18?

For 2026, these source-backed observances resolve to Tuesday, August 18. 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.

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.

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Topics represented on August 18

All topics →
Civic, Remembrance & History 2Food, Drink & Hospitality 2Arts, Entertainment & Lifestyle 1Relationships & Family 1Health, Wellness & Awareness 1
7 date-resolved records

All observances on this date

Source-backedFixed Annual

Bad Poetry Day

18 August · United States / creator-defined informal Wellcat arts observance

The first-party Wellcat Holidays calendar lists Bad Poetry Day on August 18 and identifies the collection as created by Thomas and Ruth Roy.

Source-backedFixed Annual

Constitution Day of the Republic of Indonesia

18 August annually · Indonesia / civic commemoration

Indonesian government statistical-agency pages identify 18 August as Constitution Day of the Republic of Indonesia and describe it as an annual commemoration.

Source-backedFixed Annual

National Couples Day

18 August · United States / informal relationship observance

National Today and Days Of The Year independently place National Couples Day / National Couple’s Day on August 18 each year.

Source-backedFixed Annual

National Ice Cream Pie Day

18 August · United States / informal food observance

National Day Calendar and National Today independently place National Ice Cream Pie Day on August 18 each year.

Source-backedFixed Annual

National Soft Serve Ice Cream Day

18 August · Informal food-calendar usage documented by Association of Nutrition & Foodservice Professionals chapter material

Two Association of Nutrition & Foodservice Professionals chapter calendars from different publication years list National Soft Serve Ice Cream Day on 18 August.

Source-backedFixed Annual

World Breast Cancer Research Day

18 August annually · International breast-cancer research awareness campaign

The World Breast Cancer Research Day campaign identifies 18 August as World Breast Cancer Research Day; New York State’s Department of Health also describes it as observed every August 18.

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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