I think the 09 TA Nats are still up in the air. Last I heard they're still looking for a new location since after this year the hotel will be destroyed and they won't be able to hold the show at that location anymore.
Something I would like to piggy back off of is the Pontiac Nationals, they're very open to working with groups and giving them their own area on the show field and letting them have their own show classes. There's a lot things to do in the area, lots of hotels, and with 1000+ cars drag racing and car show there's plenty to do during the show. They also have some of the best hospitality out of any show I have ever been to.
I know it's kind of short notice, but Scott Settlemeire from GM is helping organize this event
http://www.indycamaro.com/Indy08/showindex.htm they're going to be releasing the production Camaro at the show, you get a lap at the track. Scott said if there aren't atleast 1000 f-bodys he might take up smoking again. We could just piggy back off the show. I know it wouldn't be the 20th anniversary but it's a great event that we could tag along off of.