Just to add my opinion, I don't think one night will kill you. I am finishing my SD cycle today. I did 4 weeks at 10/20/20/20. My birthday fell right in between and I got bombarded with shots that night which would probably = well over 12+ beers. Other than that one night, I haven't really drank or had the desire to drink while on SD. SD kills the urge for some reason, And I love to go out drinking, always have since college. 12+ beers in a night was the usual for the weekends. Besides a slight hangover, I haven't had problems from that one night. Now, my liver might be elevated but I am sure it will correct itself in time. The body is amazing in correcting itself as long as you listen to it and do not overdue something drastically. I have a log of my SD going in the cycle forum if you are really interested.
Going back on SD, I now know a 3 week cycle is plenty, the 4th week is just worthless. I got all my gains in just the first 3 weeks. Sometimes shorter is better.