so ds birthday party isn't until the first weekend in December, but I was wondering a few things:

1. when should I send invites? some will be going to the kids at his preschool and I don't know their parents, is it still acceptable to invite these kids?
2. how long should I give people to RSVP?
3. I want parents to tell me if their kids have any allergies, well before the party date, how can I word this on the invite?
4. what do I do about people who don't RSVP? still cater for them?
5. I will be happy if siblings and parents of the invited children stay for the party, how do I word this on the invitation?

thanks I think that is all I need to know