Science-based Holidays?

[not your typical...]

Newton's birthday is January 4th. We could have Newtonian Day, where we attach strings to apples and hang them from trees, and the kids get a piece of candy for every of Newton's laws they can name.

Einstein's is March 14th. Relativity Day seems a nice one, where you email nice letters to all of your relatives about gravitational time dilation or redshift.

Let's do it! *she says eagerly while wondering if she should even be allowed to post in this thread*