January 1st: Polar bear plunge day

January 2nd: Buffet day

January 3rd: National sleeping day

January 4rth:Trivia day

January 5th: Bird day

January 6th: Three kings day

January 7th: National bobblehead Day

January 8th: Earth rotation day

January 9th: National law enforcement appreciation day

January 10th: National houseplant day

January 11th: National clean your desk day

January 12th: National pharmacist day

January 13th: Rubber ducky day

January 14th: National dress up your pet day

January 15th: National bagel day

January 16th: Fig Newton day

 January 17th: Michelle Obama’s birthday

January 18th: Martin Luther King Jr. day

January 19th: National popcorn day

January 20th: National cheese lovers day

January 21st: National penguin day

January 22nd: National blondie and brownie day

January 23rd: Pie day

January 24rth: Peanut butter day

January 25th: Burns night

January 26th: Australia day

January 27th: National chocolate cake day

January 28th: National daisy day

January 29th: Build a puzzle day

January 30th: National croissant day

January 31st: National hot chocolate day

Cites:

https://www.holidayinsights.com/moreholidays/january.htm

https://nationaltoday.com/january-holidays/