Asheville where? Do a yahoo! or google search for something like "New England Mountain bike race" or something of the sort. Your lbs should be able to help get you started as well. Good luck with the racing, it's a blast.
Well here's some places to get yourself started. I haven't looked a whole lot but there is a Charlotte Mountain Bike Race Series that you could look into. Here's a link to a place with some more links (including one ot the charlotte series). CLICK HERE FOR RACES