Thanks for replying everyone. I just want it to be perfect for him so I'm kind of freaking about the no RSVP's because I always RSVP in a day or so if I can.
I don't really know any of the parents because I let him invite his friends and I've never even seen some of them because their kids arrive at school early and go to after school care.
Now i wish I knew the parents in his class better. He's such an awesome kid, he deserves better than a total social retard for a Mum

I'm blaming FB for people who don't RSVP. Maybe is not an acceptable reply unless you're 37+ weeks pregnant or on a transplant waiting list.