Whats and easy dish to feed 30 people?

I am part of an after school program where a group of us get together at the school from 5-7:30. The first half hour we eat. Then after that the kids go play and the parents talk about raising children and other issues. Well every week a family is asked to bring the meal. Next week is mine. I have no idea what to make. So far this year there has been taco's and BBQ's and Hot dogs. I am looking for something diffrent and good that will appeal to adults and children. I have a crock pot so maybe something with that??? HELP!!!