It was all about being 5. I deliberately wrote it to get away from the paradigm of Things You Know, Your Goals, Every Game Has To Have Conflict.
Cat and I started by making a list of archetypal characters by coming up with their name and a couple of aspects, like Evelyn, Griefer, Insecure and Stu, The Stinky Kid, Kind To All Living Creatures. (And directly sent the cast list out, because I was hitting up on my writing deadline.) Then we started building up plotlines in terms of things that people cared about, so there was a kid that really wanted to have a showdown marbles match, but his bag of marbles was missing, and the other kid was uninterested; there was a TV programme that everybody watched and loved; some kids had seen a rabbit in the local park and wanted different things for it - and one kid thought that it was a wererabbit. Things like that. Then I put in some events that the GM could poke in if there was a problem with pacing - birthday cake, Pass the Parcel and Pin the Tale on the Donkey, decorated the room, and let it run. Holy cow did the characters get hyperactive. 