J.B.
My son is 2 and so are 2 of his buddies . . . so between them we've experienced 3 second birthdays in the last 4 months. Here's what I got out of it:
Skip the games; they don't get it. Most especially don't get a pinata!! Lol.
There was a bounce house at 2 of them . . . a total hit!! Great idea.
Keep the food simple . . . one of my friends made this amazing homemade macaroni and cheese for the little guests and not one kid would touch it . . . much too "exotic" for their toddler palates, and there was way too much to do to be interested!!
Don't plan it at naptime!!
Good luck!!