CASA - The Contemporary A Capella Society

 I agree with everything except the acknowledge the audience thing - definitely a personal preference, and I would say in any - literally ANY - other performance venue, yes, absolutely, acknowledge the audience.  But when I'm judging a competition and the seventh group in a row stops and asks the audience if they are enjoying the show... seriously, just sing already.  

Yes, groups need to acknowledge the audience, but in a competition set, following Amy's excellent advice in #'s 10 and 12 is enough.  It's obviously a personal preference, but I feel like in a competition it's understood that there are enough groups there, the point is to perform the set, I feel like talking to the audience is an unnecessary distraction.  Add to the fact that most groups aren't terribly skilled at addressing the audience (a skill that ought to be practiced, practiced, practiced)... IMHO, not needed.

Every other word, however, I'm 100% in agreement!