Super Mario Bros Day
Super Mario Bros Day is held on September 13. This event in the second decade of the month September is annual. 
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The first in the Super Mario series, it was released for the Famicom in Japan in 1985, and for the Nintendo Entertainment System (NES) in North America in 1985 and Europe in 1987.
The game was designed by Shigeru Miyamoto and Takashi Tezuka as "a grand culmination" of the Famicom team's three years of game mechanics and programming.
Similar holidays and events, festivals and interesting facts
Video Games Day on September 12 (The Nimrod was a computer built and displayed at the Festival of Britain in 1951 and designed to play a game called Nim);
Defy Superstition Day on September 13
Blame Somebody Else Day on September 13
Positive Thinking Day on September 13
Roald Dahl Day on September 13
Uncle Sam Day on September 13
Fist of the North Star Day on September 13
International Dot Day on September 15
Confucius Day on September 15 (Confucius' birthday falls on the 27th day of the eighth lunar month according to the Chinese calendar);
Felt Hat Day on September 15