If you don't already know, pi day happens on March 14 (3-14) every year. Festivities include reciting digits of pi and eating pies. I understand that it's all in good fun, but I've always felt that pi day is bad PR for mathematics. To non-mathematicians, it gives the impression that mathematics is about voodoo numerology, memorizing (or computing) digits of pi, and bad puns. The bad puns part is pretty accurate, but I don't care for the others.

So I propose we come up with some alternatives to pi day that send a better message about what mathematicians do. If you've got an idea, post it here. If possible, include the following information about your proposed holiday:

• when is it celebrated?
• what are the festivities?
• what kind of food would be associated with this day?

Please post only one proposed holiday per post. If you have more than one, please post multiple answers.