I have issued invitations for DS' birthday party.
Out of 12 I have heard from 2 people.
I need to confirm numbers as it's being held at a place where you pay per child and I don't want to pay up front for 12 if only 10 turn up.
I saw a parent this morning and casually said 'Can x and y come to z's party..?' and she said 'Oh yes' in a tone of voice which seemed to suggest it was obvious. Am I supposed to be a mind reader ? 
I feel a bit silly having to chase people up, but I will need to know sooner or later.
And what if people don't reply and then turn up on the day and I haven't 'paid' for them?
Help dear MNers with more experience of children's parties...