Just before I went to bed, I realised that "I shouldn't have drunk the wine last night" is the ONLY thought most people have after meeting any kind of bar, and from my background (not in medicine) it is a common next day thought, and nothing unusual. Most people you will have met on that day will feel the same, too. Shutting up now, but really, any event where wine or other drink is free-flowing, the people you most worry about will usually have imbibed, at least twice as much.