John,
I haven't attended since 1999, but having moved back to Reno late last year it's one event I'm so looking forward to this year.
I believe the official HAN limit is around 5,000 cars, but that doesn't stop anyone with a Rod or custom bringing it to town. There's something for everyone and a real busy schedule all over town and up at Lake Tahoe to keep you occupied. This year it is being held between July 29 and August 6 (the Friday through Sunday being the best time and most crowded). The hardest part will be finidng accommodation, many of the hotel/casinos get sold out about a year in advance.
Normally I'd offer a room to a fellow Pantera owner, but I have family coming out from the UK at that time for the same reason.
Get more info on the official website at
http://www.hotaugustnights.net/If I can help out in any way being local, drop me a line off board or send a private message.
Julian