Just have a protein bar around 11 or 11:30. I usually leave the bars and walk over to a healthy restaurant and get something to eat if I am at the bars for a long time. I don't drink, but I am assuming that you do when you are out. If you are really concerned about your progress, try to limit how much you drink to 2 or 3 drinks at most. I just always have cups of water whenever I am out.
P.S.- see if you can have a female friend keep you protein bar in her purse...it will be a mess if you keep it in your pocket.