National Mario Day
National Mario Day is held on March 10. United States. This event in the first decade of the month March is annual. 
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National Mario Day, meant to celebrate and honor the Mario character owned by Nintendo, is celebrated on March 10th. The date was chosen because it looks like Mario's name - MAR 10. Mario is the character in the best-selling video game franchise in history - Mario, created by game designer Shigeru Miyamoto. Mario character was initially released by Nintendo in 1985 — doesn't that make you feel old?
A legendary Nintendo video game character, Mario was born in 1981. Initially, he was named Jumpman, and was a carpenter, in the arcade game Donkey Kong. The same year, Nintendo of America renamed him Mario.
Pauline was known as Lady, and the game introduced her as Mario's girlfriend. The name Pauline was given after the then-girlfriend of Nintendo of America's warehouse manager, Don James.
Similar holidays and events, festivals and interesting facts
Barbie Day on March 9 (Barbie debuted on March 9, 1959 at the American International Toy Fair in New York);
False Teeth Day on March 9
Get Over It Day on March 9
International Bagpipe Day on March 10
Check Your Batteries Day on March 10
The International Day of Awesomeness on March 10
Pack Your Lunch Day on March 10
International Mario Brothers Day on March 10
World Plumber’s Day on March 11 (initiated by the World Plumbing Council);
Fill Our Staplers Day on March 11
Worship of Tools Day on March 11