Regarding alcohol consumption at work-related events...
Even if you're getting together with coworkers outside of work, a nice casual get-together, please, please, PLEASE remember that these are the people you will be facing on Monday!
It seems one of my coworkers was less than well-behaved during a recent drunken binge. She said hurtful things to managers who were present and was generally a "mean drunk."
When discussing things with another who was there, I reminded them that even though these are not specifically work events, they are with people who are NOT their friends, but coworkers, and that what they said/did at such events still reflected upon them.
Her response? "Oh, wow - I didn't even think about that!"
And this is why we STILL don't have a firm answer on our contract!