Atheist Holidays

Atheists should have their own holidays. It seems a pity to have to piggy-back off of religious holidays--we should have our own. I've looked around a bit and the ideas I've found are pretty lame. Winter solstice? Seriously?

http://atheism.about.com/od/adviceforatheists/a/hol_alternative.htm

I say we should just appropriate some. New Year's Day seems a good one. So is July 4. Arbor Day is another. April 1, of course. And we certainly should invent Atheism Day. You get the drift.

The more interesting question is: how should atheist holidays be celebrated? With rituals? I'm going to have to think more about this, but I'm too sleepy just now.