I tend to agree with Maureen... (and HI btw!

)
I don't attend all that many shows...but I'm 'on' from the minute I arrive in the city where the show is being held. Actually, I tend to be aware even from the airport where I'm catching the last leg of the flight in, that I 'may' run into some industry people also travelling to the show.
And I stay 'on' up until I land in LA on my way home, cos you just never know where you're going to run into 'work' people.
Even tho I drink, I don't take it to the point where I lose control of my faculties (ok perhaps excepting that one night that ScottPB plied me with illicit substances and I ended up standing in the foyer of the Venetian talking to Sykk and Punky, swaying the whole time).
I LOVE attending the shows (hint hint Bill, time I did another one

)...but I'm always aware that despite the fact that they're enormous fun, and a huge adrenaline high, they are still, and most importantly, work, and my behaviour should reflect that, from beginning to end.