Well, I've done one. I made it out in September, and missed the final run in October because of work.
As far as learning the ropes goes, I'm good to go even after that one event. It's really not that complicated. Plus, something just popped into my head - April 1st and 2nd are school and test & tune days, not competition, right? That'll make a good refresher, and I'll be all set.
Still, the thought of extra seat time is definitely alluring. That's a tough call. Good thing I have plenty of time left to decide