I highly suggest the USASA events. It's a really good atmosphere, friendly people, raffles after every event, and free goodies from the sponsors. It's all ages and abilities, although you are judged/timed by your age group, but it's just a lot of fun and really helps improve riding all around. Yes it's competitions but its a very relaxed atmosphere. It's been a few years but I think the cost is 75$ for the membership and 20 per event if you register online. Helmets are required in all events.
Met some of the friendliest people ever here at the SnowOhio series, including Louie Vito, who used to kill it here in the slopestyle/halfpipe events.
I don't know about others areas, but around here the events are..
They have one at boreal and alpine, which are in the tahoe area, kinda far from you haha.
but if you want an olympic-ish one, Sugarbowl has the actual course one of the guys trained on for the ski cross, idk if the course is any different? but they plan on opening it to the public soon.