Please see this post http://forums.dfwmiata.com/viewtopic.php?t=93
Actually, I may be the only one on here. Seems SCCA Divisional is that weekend at MineralRing, and everybody is going there instead.
Seats are MUCH better than infield for watching the race - if that is why you are there. We're just below the mezanine at the entrance to pit lane. Great seats. About 10 of us sit together - season tickets since first year.