One neat game is to create a grid and fill it with questions instead of numbers. Use things like- someone with scar longer than 4"- someone who has never been to Washington, DC- someone who speaks more than one language-- you get the idea. It helps if the person making the game knows at least some of the participants, because you can write things about them. People walk around talking and fill in their cards when they meet someone who "fits" a square.
Another idea is lie, lie , truth. You can do this in small groups or as one big group. Each person introduces themselves then tells 2 lies about themselves and one truth. The group tries to guess which is which.