Source-backedEdition Specific
Tsagaan Sar
Mongolia’s Ministry of Foreign Affairs embassy site lists the 2026 Lunar New Year (Tsagaan Sar) public-holiday closure dates, and the Mongolian government documents preparations for the hol…
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Celebrations & Social observances
Social celebrations, informal traditions, participation days and light-hearted community occasions.
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Authority records
Source-backedRule Based Annual
Tynwald Day
Tynwald, the parliament of the Isle of Man
Source-backedRule Based Annual
Use Less Stuff Day
A 1998 Washington Post article documents Use Less Stuff Day as an established pre-Thanksgiving waste-reduction campaign, while recurrence documentation identifies the modern rule as the thi…
Source-backedFixed Annual
Use Your Common Sense Day
Bud Bilanich’s own site states that he created Use Your Common Sense Day as an annual event on 4 November and chose the date because it is Will Rogers’ birthday; a later creator post repeat…
Source-backedFixed Annual
Walk on Your Wild Side Day
Thomas and Ruth Roy’s first-party calendar lists Walk on Your Wild Side Day on April 12.
Source-backedFixed Annual
Walpurgis Night
Visit Sweden identifies Walpurgis Night on 30 April as a major Swedish tradition welcoming spring.
Source-backedVariable Custom
Wear BLUE Day
Men’s Health Network identifies Wear BLUE as its men’s-health awareness campaign; annual scheduling should be checked against current organizer material.
Source-backedFixed Annual
What if Cats & Dogs Had Opposable Thumbs Day
The first-party Wellcat Holidays calendar lists What if Cats & Dogs Had Opposable Thumbs Day on March 3 and identifies the collection as created by Thomas and Ruth Roy.
Source-backedEdition Specific
Whit Monday
Official 2026 holiday calendars, including Germany’s, list Whit Monday on 25 May 2026.
Source-backedFixed Annual
White Day
Japan National Tourism Organization material identifies White Day on 14 March and explains the return-gift custom.
Source-backedRule Based Annual
White Sunday
Samoa Tourism explains White Sunday as a major Samoan children’s and church observance; official mission calendars document the adjacent 2026 holiday observance.
Source-backedFixed Annual
Wonderful Weirdos Day
The first-party Wellcat Holidays calendar lists Wonderful Weirdos Day on September 9 and identifies the collection as created by Thomas and Ruth Roy.
Source-backedFixed Annual
World Compliment Day
The official World Compliment Day site directs its 2026 awards and participation to March 1, consistent with the observance identity.
Source-backedFixed Annual
World Party Day
timeanddate and National Today identify April 3 as the annual date associated with World Party Day.
Source-backedEdition Specific
World Quantum Readiness Day
DigiCert’s current event page and August 2026 announcement identify the third annual World Quantum Readiness Day on 17 September 2026.
Source-backedFixed Annual
World Savings Day
WSBI states that World Savings Day continues to be observed every 31 October.
Source-backedEdition Specific
World Scout Scarf Day
The UK Scout Association’s 2026 programme calendar lists World Scout Scarf Day on 1 August and explains the scarf-wearing tradition.
Source-backedRule Based Annual
World Smile Day
The World Smile Day organization traces the observance to Harvey Ball and identifies the first Friday in October as World Smile Day.
Source-backedEdition Specific
YMA Day
Government of Mizoram’s 2026 holiday list identifies YMA Day on 15 June.
Source-backedFixed Annual
Yorkshire Day
The Yorkshire Society documents Yorkshire Day on 1 August and its civic celebration tradition.
Source-backedRule Based Annual
Zero-Tasking Day
Creator Nancy Christie describes Zero-Tasking Day as using the extra hour when daylight saving time ends to do nothing; later creator-profile coverage likewise ties it to the first day of S…