Yes!!!  We love having the parents stay at parties, we always need grown ups to volunteer for games!
As long as the grown ups remember this is a party for the children, and they can keep chattering to a low volume as the children need to be able to hear the show and instructions for games, but we much prefer it if the grown ups join in with all the fun, and if an adult is caught on a phone…well Ditzy won’t spoil the fun she has with that, let’s save that for the party, let’s just say it will be a magical experience with the volunteer on the other end of the phone!