It will be 50/50 kids and adults. I work full-time so can't be arsed with anything needing lots of prep. Ideally something that can be prepared in advance and then heated up but if not something that is pretty robust and doesn't spoil easily. I have a slow cooker of necessary that would probably for in enough for half of us. Happy to do something separate for kids and adults (have often done pizza for them first then something else for us) but keen on some new ideas hence posting here!
How about some sort of make your own taco/wraps? Cook up a big pot of chilli/pulled pork/beans the day before, and then just lay out a big pile of tortillas and salad bits and other odds and ends (maybe some sour cream/guacamole/grated cheese/hot sauce etc) and everyone can make their own.