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Evergreen date guide

What is celebrated on September 13?

For 2026, these source-backed observances resolve to Sunday, September 13. Recurring rules can move in another year, so each record keeps its own date logic.

Date authority profile

What this date contains

11 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 September 13

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Topics represented on September 13

All topics →
Health, Wellness & Awareness 3Animals, Nature & Environment 2Arts, Entertainment & Lifestyle 2Civic, Remembrance & History 2Food, Drink & Hospitality 1Relationships & Family 1
11 date-resolved records

All observances on this date

Source-backedFixed Annual

International Chocolate Day

13 September · International / informal chocolate observance

National Today gives International Chocolate Day a fixed September 13 recurrence, and Retail Confectioners International independently promoted International Chocolate Day on September 13.

Source-backedEdition Specific

IRONMAN Wales

13 September 2026; verify each year’s race date · Tenby, Pembrokeshire triathlon event

IRONMAN

Source-backedEdition Specific

National Celiac Disease Awareness Day

13 September in U.S. recognition history; 2026 nonprofit edition verified · United States / celiac-disease awareness recognition

A U.S. Senate resolution designated 13 September 2010 as National Celiac Disease Awareness Day, and Beyond Celiac continued to mark 13 September as the awareness day in its 2026 materials.

Source-backedRule Based Annual

National Hug Your Hound Day

Second Sunday in September · United States / pet appreciation observance

National Day Calendar identifies National Hug Your Hound Day as the second Sunday in September and attributes its creation to Ami Moore. Independent calendar corroboration produces dates co…

Source-backedRule Based Annual

National Pet Memorial Day

Second Sunday in September; 13 September 2026 · International Association of Pet Cemeteries and Crematories remembrance observance

The International Association of Pet Cemeteries and Crematories says National Pet Memorial Day is observed on the second Sunday in September and was established by the association in 1971.

Source-backedRule Based Annual

National Pet Remembrance Day

Second Sunday in September (13 September in 2026) · Pet-loss remembrance / organizer-led annual observance

The official Pet Remembrance Day site states that National Pet Remembrance Day is observed on the second Sunday in September.

Source-backedFixed Annual

Pet Birth Defect Awareness Day

13 September · Pet/veterinary awareness-calendar usage

The Animal Medical Center lists Pet Birth Defect Awareness Day on September 13 in multiple annual veterinary-awareness calendars.

Source-backedFixed Annual

Roald Dahl Story Day

From 13 September annually under the current charity campaign framing · Literacy/storytelling celebration and charity fundraising context

Roald Dahl’s Marvellous Children’s Charity currently promotes Roald Dahl Story Day as an annual global celebration beginning from 13 September, with schools able to choose a suitable partic…

Source-backedFixed Annual

Uncle Sam Day in the State of New York

13 September · New York State, United States / statutory commemorative day

New York Executive Law §168-a expressly lists September 13 as Uncle Sam Day in the State of New York.

Source-backedFixed Annual

World Sepsis Day

13 September · Organizer-backed international observance

Global Sepsis Alliance (GSA)

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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