For those who say "travel" and "ski the larger events," take juniors into consideration. I'm 17 and when skiing local tournaments there is NO ONE in my division. most guys are skiing 34 instead of 36, and only a handful are on my level (usually run -32), some are much better and some are worse. I don't really have anyone to ski against so it isn't as fun as it should be. There are only two tournaments a year where I actually feel like I'm competing and that's regionals and nationals. "Larger" tournaments still have avery small participation from juniors. I believe that is a big reason why people my age don't want to get into this sport... they don't have a group to do it with.
I think many of us agree that nat's can be a royal pain in the ass, so make that one tournament per year for someone my age. If you're wondering about state tournaments, in TN there are usually only around 3 B3 slalom skiers... not much competition.