Happy 05-07-09 Day!
Yes, it's a real holiday! Only one of 6 days this century where the date is 3 consecutive odd numbers. The last one was 03-05-07, and the next won't be until 07-09-11. There's even a contest with a $579 prize for the best Odd Ode, the most people in the Oddest Parade of Odd Characters, or the best Odd Celebrations.
But why not celebrate Even Day? I'll let the founder, Ron Gordon, explain:
...it's one thing to encourage folks to do something odd for fun. But it's very different to urge them to get even with someone.
Oh man I love my puns....XD