SNOWBALL FIGHT! (Open to everyone)
With so much snow laying on the ground, it didn't take much for the kids of the City to start playing with it. At first they hadn't known what to do, but instinct took over in no time. They were soon building things with it, making snow angels... and snow demons.... and then one kid had the brilliant idea to pick up some of it, turn it into a ball-ish shape, and hurl it at one of his friends.
It started a small war.
Soon enough, random passers by were caught up in it, forgoing everything else they had been on their way to do, and joined in.
About an hour later, everything in the City was closed so that anybody who wanted to could join the big snowball battle.
Errant snowballs flew, giving no regard to who they hit or how hard.