I forgot the name of this ice breaker game but when my home chapter of Sigma Alpha Iota hosted their province's Province Day on the last rotation, we did this:
You'll need paper, tape that can stick well on fabric/clothes and writing utensils that will show up well so people can read stuff fast.
On each piece of paper, write a name of a celebrity/ important figure. They all need to be different.
When people arrive, assign each person a celebrity by placing the piece of paper face up and taping it on that person's back so they can't see it. The game is to have this person figure out which celebrity they are, so you can give hints and let them know if they are close. It's pretty fun.