Howdy All!
If I have time, I'll make up an interactive story using the birthday kid's name and the names of some of his guests, if possible. I'll print it out with pictures and get it lamenated and made into a book at Kinkos or somebody. Whenever the birthday child's name is mentioned in the story the kids have to scream. I also give the kid a squirt of "Happy Clown Water". It's just water in a squirt bottle, but they don't care! They love it! If the guest hear their own name they are so surprised. One time, I put the parent's name in and the kids went crazy! They started screaming for me to squirt her, which I did! It was fantastic and the birthday kid ended up with a special book to keep forever!~