Most kids aren't great at sparkling repartee. If you want them to bond with one another — or at least stay occupied so the grown-ups can talk — give them something to do with their hands. Making aluminum-foil ring chains is the perfect, zero-supervision party project — no glue, no scissors, no sparkles to vacuum up. All you need to provide is squares of foil (get an older child to cut up a roll or buy a box of the precut sheets that delis use to wrap sandwiches). Then, if you can, put the kids to work in a spot where they won't interfere with party traffic. Let them take home their handiwork.