December 3
December 4
- National Sock Day
- National Dice Day
- National Cookie Day
- World Trick Shot Day – First Tuesday in December
December 7
- National Illinois Day
- National Pearl Harbor Remembrance Day
- National Cotton Candy Day
- Faux Fur Friday – First Friday in December
December 8
- National Brownie Day
- Pretend To Be A Time Traveler Day
- National Rhubarb Vodka Day – First Saturday in December
- Skywarn Recognition Day – First Saturday in December
December 9
December 10
December 11
December 12
December 13
December 14
- National Alabama Day
- National Bouillabaisse Day
- National Salesperson Day – Second Friday in December
December 15
- National Wear Your Pearls Day
- National Cupcake/ Lemon Cupcake Day
- Bill of Rights Day
- Cat Herders Day
- National Wreaths Across America Day – Third Saturday in December
- Free Shipping Day – Changes Annually (Tentative)
December 17
December 19
December 20
- National Sangria Day
- Mudd Day
- National Re-Gifting Day – Thursday before Christmas
December 21
- National Maine Day
- Anne & Samantha Day(also June. 21)
- National French Fried Shrimp Day
- Crossword Puzzle Day
- Humbug Day
- Phileas Fogg Win A Wager Day
- Winter Solstice – Day Between December 20 and 23
- National Flashlight Day – Day of Winter Solstice
- National Homeless Persons’ Remembrance Day – First Day of Winter
- Yule – Day of Winter Solstice
- National Ugly Christmas Sweater Day – Third Friday in December
- Underdog Day– Third Friday in December
December 22
- National Date Nut Bread Day
- Forefathers Day – December 22 (Unless on Sunday, Then Following Monday)
December 23
December 24
December 26
December 27
December 29
December 31
- National Champagne Day
- Make Up Your Mind Day
- New Years Eve
- No Interruptions Day – Last Work Day of the Year
- Universal Hour of Peace
- Leap Second Time Adjustment Day (Note: This is listed as an observance title only. Some years scientists do not make adjustments. But, if they do, then it’s done on either June 30 or December 31.)
*Day * – Proclamation
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