In all honesty, you will likely end up drinking if you go on this trip. You will likely need several weeks to several months of abstinence before you can handle staying sober around so many drunk people. Maybe, if you can find a friend who will not drink with you the both of you can stay sober. This way, you won't feel alone when everyone else is making asses of themselves.
Going with another non drinker just might be your safety net to avoid drinking while still attending.