Mario Day
March 10 · Level 9 · #448 of 2238
A fan-made holiday for the world's most famous moustached plumber. The date works because 10 March, written MAR10, looks a lot like MARIO.
How it is celebrated: players replay favourite levels, hold Mario Kart tournaments with friends, and pull on red caps and fake moustaches. Game makers and shops often time news and special offers for the day.
Mario first appeared in the 1981 arcade game Donkey Kong, where he was called Jumpman and worked as a carpenter, not a plumber.