DS is in a class of only 12 and two children are having a party at the same time (different locations obviously). Fortunately as it it's the Sunday before they go back after half term so we will be away anyway and can't go to either. But what's the usual form, do you accept the invitation that you get first, or the the party for the child that your child likes best? And if your child is going to one party do you RSVP to the other just that your child can't go, or do you say that they are going to the other party? What do you do if you have already accepted one but then get another invitation that your child would prefer, obviously you can't really back out of the first but would it be ok to go to the first for half an hour and then go on to the second?