In all reality, if you feel that the alcohol use at an event has gone over the top, you do the same thing you'd do if it were your next door neighbor: alert the authorities. Very few sites are out of cell phone coverage, and the local or state police should be able to reach you shortly.
Pine River Boys, Co I, 7th Wisconsin
"We're... Christians, what read the Bible and foller what it says about lovin' your enemies and carin' for them what despitefully use you -- that is, after you've downed 'em good and hard."
-Si Klegg and His Pard Shorty