The day is mine, Trebek!
Today is 3/14, and math fanatics will tell you that it is Pi Day, and you will be regaled with stories of crazy college parties from math nerds. Drinking games involving calculus? YES.
Anyway, if you want to be really nerdy, you can celebrate e day (2/7), mole day (10/23), the day the world implodes (sqroot(-1)), etc. etc. etc.