I need some advice. This is the first party I will have thrown for DS1 outside of our home. I have hired a large church hall. I'm wanting to invite approx 20 children (ages 4 & 5) some from his new class. I'm thinking it would be best for a parent/carer to stay with child. The party is 2 hrs long with booked entertainment. I'm not sure what the norm is with parents staying or just dropping off. The hired space has a few doors to other areas of the church and a couple of exits. I could maybe ask for a couple of family members to man the doors, but I'm not overally familiar with some the children. I hope some of you can share some experience.