Where would you start??

Guys, I feel like such a bad mom. I really want to make her 1st birthday special, but it really snuck up on me. We're having DD's party at our house on the 19th at 2pm and other than getting the invites out, I have nothing else planned except for some general ideas. We will have 35-40 people there (10 kids, ages 9 mo - 10 yr). I have no decorations, no food ordered, no games...

Help me get a game plan please!