We were in the noon batch of party assembly. One of eight other parties hosted in the party room. Each party group had their own space - though most shared a table. It wasn't uncomfortable though. Because these tables were modeled after something out of a Viking longhall (that means they were very, very long).
The thing was carefully coreographed as well. Party shows up at noon. kids play games for ten minutes. Pizza arrives. Kids eat pizza. Kids play games. At 12:45 Chuck E. Fargin' Cheeze himself comes out, all the kids run up to dance with him, and scream and holler and sing. In short order they're all herded back to their chairs to continue to scream and holler and sing for a bit. And at the end of it all, the birthday kids blow out their candles.
Then kids eat cake, and run off to play more games. The adults grab what sustinence they can (incidentally Worst. Pizza. Ever.), and haul tail out of there, because you only have the table until 1:30. Then they need to set up for the 2pm party assembly line.
We had the birthday girl open her presents in the other room. Those interested could stay and watch, while the rest could run around like maniacs spending tokens and collecting tickets to claim (*cough* crap *cough*) prizes.
All and all, not a bad way to handle a party for a three year old girl who had to invite hordes of boy cousins when she wanted a "princess party." She got all her princess things, and they got distracted by all the games, flashing lights, beeps, sirens so they didn't even notice the icky girl-theme.
Now she's sleeping soundly, unaware that when she wakes on the morning of her actual birthday, she'll have a new playhouse waiting for her in the back yard. And of course a new princess tiara (number three of the birthday season) and princess scepter so she can pretend to be Princess Lolly, the greatest acrobat in Candyland.
Going to be a very full weekend for her. And for us as well.

E had his party on Friday. We're having family bday tonight. But he was supposed to unload the dishwasher yesterday and didn't. Today we had him do it and, lo and behold, his birthday present was in it.