Tom -
I am a member of a club, and we have had discussions about this from time to time. I'm not a lawyer, but I don't believe the law on this is cut and dried - if nothing else, it will vary from state to state. However, I don't believe that disclaimers, waivers, etc. between members of the club would be of much use. The exposure here would be the potential liability to a third party, injured by a club member or guest after a club event. No amount of legal agreements between the club members would prevent an injured third party from suing those involved (although proving negligence might be harder, depending on the facts of the case).
This is precisely what "dram-shop" insurance is designed to cover, so that is one potential solution. Bars and liquor stores pretty much have to go that route, but it's expensive. Aside from that, I don't believe there is any particular "safe-harbor" rule or documentation that would be guaranteed to protect you from liability. The best I can come up with is to use good-faith efforts to assure that nobody sells or serves alcohol to a member who appears to be intoxicated. Our club, for example, has purchased a breathalyzer machine, and we have made this available to members at meetings, in cases where they weren't sure they were legal to drive. Something like that, along with periodic reminders of club policy on avoiding potential drunk driving situations, would help refute claims of negligence. They are no guarantee, of course, and sympathies in court are more often with the injured party, but that's the best I've been able to come up with.
Doug