So DD attended a party for her class, shes just finishing reception year. It was in a hall with a bouncy castle. The parent advised it was a drop and go party on the invite which I thought was good so I dropped DD and left to run some errands. When I returned about 15 minutes before the end I saw that most parents were there and it turns out basically they all stayed. Most of the parents seem quite chummy anyway I feel a bit funny that I was the only parent to drop and go. It seems like they all decided in a group to stay and catch up with each other. AIBU to feel a bit annoyed about the whole thing?