DS is 5 in August and we've booked his party in for the last weekend of July. Invites went out a week ago and I've had 8 refusals and 3 acceptances from a class of 30 to date. I expected some of the class to be away WWYD? Cancel and reschedule for September or hang in there a bit longer to see if more parents confirm? I'm starting to panic. DS will be heartbroken if no one turns up. And so will I!
I think you have to expect, if you book it for the holidays, then a lot of people will be away. As to if you can do it with invitees in single figures - I guess that depends on the activity / type of party you are doing. However, you now know... a lot of people don't come to parties in the school holidays...they are wither away or just forget (lose track of the days / out of routine, etc.)