There always seemed to be a lot of "concerned" dads wandering over to the kids area to check on their sons and daughters. At a cousin's Bat Mitzvah when I was about 20 my father confided in me that the dads wanted to eat the kid-friendly food, instead of the "fancy stuff" and that's why they checked on their kids so often.
Kid-friendly foods always attract adults and I think it's part nostalgia and part deliciousness. how many times do we, as adults, get to eat mac n cheese, sliders and chicken fingers?
When planning your cocktail hour - whether you're having kids at your wedding or not - talk to your caterer about adding some of the traditional children's menu item to your "adult" menu. These items will probably be the first ones the waiters run out of!