Cohiba, I'm not a boxing fan, but know the importance of the fight and can imagine for boxing fans that it is must watch.
Just an idea, but what about telling your friends you'll be there for the fight, but arriving when it starts? Maybe go to bed at like 8pm and then wake up at 3AM and go out to the place you paid for to watch the game? People will be good and drunk by then and with emotions running high leading up to the fight, probably not even realize that you're sober and not drinking.
I think planning to get there at 10PM is setting yourself up for disaster as that's a long period of time to wait for the fight to start and I'd imagine staying up all night will trigger cocaine cravings.