Well. I suppose you've noticed the guards are apprehending anyone who makes an unauthorized exit. Swarming them, frankly.

[He tips his head, indicating the hustle and bustle of the crowds around them — and in particular, the pockets where the merriment is particularly loud or raucous.]

Of course, if they were dispatched in a hurry to deal with a much more pressing concern — a potential brawl amongst guests, say — I doubt they would still have a spare eye for the doors.