It's my DS's 3rd birthday on Saturday. We invited all 8 other children in his class at the creche and so far I have only had a message from 2 of them to say whether they can come or not. I really need to know who is coming as it affects the amount of food/ organise party bags etc. AIBU to think it's really rude to not let me know? Do most parents ignore invitations for their children like this?