IMO I would stay away from those types of events because unless you have a lot of experience tracking your car you're really not going to get as much out of it. I think it is much better to get with a crew of people that run a good event and stick with them for a year or two then maybe start looking at open tracking. You'll get a lot more out of it.
This statement is really directed at anybody interested in tracking their car.
If you're on the East Coast check out trackschedule.com.
