The Dicks Ditch Slalom is super fun and cool. Nice link. Lots of variation in the lines and skill sets displayed in different racer classes in that event. The top class really tears it up and some of the weaker groups do a bit of shmearing. Everyone has a blast though and it's not too competitive, except maybe in the top class. Definitely some friendly bragging rights on the table though.
We also have a few "wiggles" around the mountain. They are well established luge type banked turns that can be lots of fun to ski through. Right now the best one is off of S. Pass traverse just past Sublette lift. It's only 4 turns or so, but the walls are huge and you can really build some speed in there. The largest wiggle is the worker wiggle that forms down the gut of Rendevous Bowl as the locals slalom the black doingers. If it doesn't snow for a while it can get big enough to be seen all the way across the valley.