[Mike Simard]

Chip, if you mean the SCCA autox's than they're probably open for you. When you look at the schedule website it may say closed but that's just because the signup period isn't happening yet, it will be 'open' closer to the event date. Remember the Gwinnett fairgrounds has a sound limit but you may be ok unless your car is especially loud, low revving v8's don't seem to have many noise problems.
BTW, AutoXMike would have some ideas but he's probably at the South Pole wrestling polar bears this time of year.