My DD8 takes a while to adjust to new situations. She usually requires me to stay a few times before she is comfortable being left alone anywhere. This gives me plenty time to scope out the scene, plus it is nice to chat with other parents.

I ask that DD stays in the yard of the parents who are hosting the playdate and to be called if they are going out somewhere. I don't regulate the playdate activities, She can eat, listen, do, or watch whatever her friend is doing.