It went really well, thanks. The "worst" thing that happened was the bakery didn't have the cake boxed up and ready to go even though we got there almost an hour after we told them we would be. Everyone seemed to have a lot of fun, even some of the parents who stayed. My kids had a blast, and that's really all that matters.
I didn't have an idea of who would be there beforehand, though. I had 6 parents RSVP for a total of 8 kids that said they were coming, and 3 parents for a total of 4 kids say they weren't coming, so I panicked a bit and invited some from the "reserve" list. On the day of, I had one of the yes parents call and say they were in the ER most of the night because their DS broke his arm, and they weren't coming, one of the yes parents call and ask what would be a good present for DS (and then never show up to the party) and one mom I hadn't invited call and say she heard of the party and she was wondering if her DS could come. So I ended up with 18 out of the 21 I invited there, and one I didn't invite there.
The only bad thing about that, was I was allowed 11 guests before they charged me $12 a head per extra kid. But the lady who was working there was really nice, we had a conversation about how people just don't RSVP anymore, and you never know how many you'll get at a party. There was one party going on when we got there, and they left, and we had another one going on later, and the lady was really great, and the 1st party only had 9 kids, and the 2nd only had 7, so she shoved 6 of my extra kids as guests on the other 2 parties, since they had room, and we only had to pay for 2 extra kids for ours.