DD is having a joint bday party with another little girl in her class. It's going to be at a gym place at 10 am on a Sunday. The place is small. Parents are required to stay with their children. We are inviting 20 children (so there will be 20 adults if all come--some more b/c both parents will come). We are doing cake and juice for the kids. What do we need for the adults? I was thinking coffee (maybe), veggies and dip? danish? mini muffins? I've never done a bday party before lunch so I have no idea what to have for the parents.