For 1 hour games show:

Best invite the children 30 minutes before the performance.

For 1.5 hour games show + face painting

Best invite the children 30 minutes before the performance. (Face painting works best as the children have their party food)

For 1.5 hour games show + pass the parcel and wand making

Invite the children the same time as the performance. The entertainer will meet and greet the children as they come in and play fun warm up games.

This leaves the last half an hour for your party food.