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Evergreen date guide

What is celebrated on December 15?

For 2026, these source-backed observances resolve to Tuesday, December 15. Recurring rules can move in another year, so each record keeps its own date logic.

Date authority profile

What this date contains

6 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.

3 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.

Reviewed depth

Other in-depth guides on December 15

Explore the mix

Topics represented on December 15

All topics →
Food, Drink & Hospitality 2Arts, Entertainment & Lifestyle 2Civic, Remembrance & History 1Animals, Nature & Environment 1
6 date-resolved records

All observances on this date

Source-backedFixed Annual

Bill of Rights Day

15 December · United States commemorative observance

U.S. presidential proclamation / GovInfo

Source-backedFixed Annual

Cat Herders' Day

15 December · United States / creator-defined informal Wellcat observance

Thomas and Ruth Roy’s Wellcat calendar lists Cat Herders' Day on December 15.

Source-backedFixed Annual

National Cupcake Day

15 December · 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 Cupcake Day on 15 December.

Source-backedFixed Annual

National Lemon Cupcake Day

15 December · United States / informal food observance

National Today and Days Of The Year independently state that National Lemon Cupcake Day recurs every December 15.

Source-backedFixed Annual

National Wear Your Pearls Day

15 December · United States / motivational observance founded by DeAnna Heard

National Day Calendar states that DeAnna Heard founded the observance, that its registrar approved it in 2015, and that it is observed on 15 December.

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 →