December 1: National Christmas lights day
December 2: National mutt day
December 3: Toys for kids day
December 4: Extraordinary work team recognition day
December 5: Celebrate shelter pet day
December 6: Saint Nicholas day
December 7-15: Hanukkah
December 16: America recycles day
December 17: National device appreciation day
December 18: National day
December 19: National Emo day
December 20: Games day
December 21: National crossword puzzles day
December 22: Mathematics day
December 23: National Christmas movie marathon day
December 24: Christmas eve
December 25: Christmas Day
December 26: National candy cane day
December 27: Kwanzaa
December 28: Pledge of allegiance day
December 29: Tik Tok day
December 30: National bacon day
December 31: New years eve
Cites
https://www.pens.com/blog/funny-december-holidays-for-promotions/