Thought about doin that last spring for Stratusphere. It would be ungodly expensive. Plus there's the problem if something got outa hand and someone crashed their car (for some unexplained reason). There's no insurance there for that and RA wouldn't have anything to do with the incident, etc.
It'd be a great place to host a meet, just maybe minus the road course use. Shit, Elkhart's dowtown park would be nice too.