A.W.
I just threw a baby shower last weekend. We played the baby food game Julia talked about and everyone was laughing and talking to each other trying to guess what they were. The baby food were all similar colors so it made it a bit more difficult. For another game I passed around ribbon and scissors and everyone had to guess how big the Mommy to be's tummy was by cutting a ribbon that length. The third game I filled a baby bottle with skittles (Mommy's favorite candy) and they had to guess how many. Everyone seemed to enjoy the games. It's kind of expected to play silly games at showers. Another shower I went to the host had melted different candy bars in diapers and they were passed around and you had to guess what it was (like Snickers, Kit Kats, chocolate candy). It certainly got people talking to each other.
I don't know if you are having a sit down meal but if you are you can try to sit people with people from other 'groups'. Depending on how many people you can divide them up into groups for the games and just mix up the groups.
Good luck!