@Anagon: I don't like livengood was directing anything at you. I know she's speaking on general terms.
Generally speaking, I don't think any con should go full prohibition, yet maybe post something like the guidelines for Arisia. I do know ALA has staffers that have done the SF/F party cons and those are usually handled gracefully and classy. At the end of the day, it boils down to drinking and partying responsibly. Perhaps ALA could run a series of panels at local cons on how to throw themed room parties (these SF/F people go all out!) and how to help out a friend if they had too much. I saw a lot of misinformation posted about the latter on Facebook invites.
The party vibe I got can be best summarized with this quote from Family Guy, "Aren't you too old to be underage drinking?"