Backward Day
Backward Day is held on January 31. In almost every culture there came a time of year when all the societal rules got turned on their head. This event in the third decade of the month January is annual. 
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So “backward” is the more American choice, and “backwards” is the more British choice, but you will find both in both languages. The way I remember that “backward” is the word in American English, is to remind myself that Americans like shortcuts.
Backwards Day was created by two women in 1961, Sarah Nicole Miller and Megan Emily Scott, who came up with the idea while on a farm. They were milking cows, thinking about arts and crafts when the initial idea came to them.
On January 31, take a break from the rut by doing everything backwards, because it is Backwards Day.
Similar holidays and events, festivals and interesting facts
Inane Answering Message Day on January 30
Seed Swap Day in USA on January 31 (The first official celebration was held on January 26, 2006, in Washington, D.C.);
Hug an Economist Day on January 31
Inspire Your Heart With Art Day on January 31
Bubblegum Day on February 1
Decorating With Candy Day on February 1
No Politics Day on February 1
Aroma Day in Japan on February 1 (Nioi No Hi)