I wanted to provide cameras and have the kids go around and take pictures of specific things (ex. "Take a picture of someone dancing." "Take a picture of the bride and groom." "Take a picture of someone eating their dinner.") I figured this would give them something to do. Originally I was going to have harder clues like "Find someone who has know the bride or groom for more than 20 years." "Find a couple who has been married more than 10 years." but have decided to make it a bit easier.
Anyways, my mom always finds the negative in things (unless it's her idea...) and she says "I don't want kids running around taking pictures of everything. That will just annoy everyone." In my opinion...I would much rather have the kids taking pictures than have them run around screaming and playing tag etc. Plus if you put disposable cameras on the tables the kids usually get ahold of them and snap away anyways.