There are assorted local sports car clubs out there that may not be affiliated with SCCA. For example, SCCA has a Milwaukee region but over here in Madison folks don't necessarily feel like making the trip every weekend. So there's a Madison Sports Car Club that organizes Solo-II style events plus some high speed events on smaller road courses in the area. They also organize some wheel-to-wheel events. It's part of the Midwestern Council of Sports Car Clubs which is kind of a loosely affiliated group. If you're in Wisconsin or Illinois, you might even have one in your town.