I'll just add that I did Avenue Q on Friday night and just did what the above people mentioned - stuffed Playbills prior to the house opening, once the house opened I stood at one of the house entrances, handed out Playbills and directed folks to their seats. At intermission, just stand at one of the exits and make sure people don't take pictures, etc.
The show was completely sold out, so I sat behind row P against the wall.
ETA: They generally reply to email VERY quickly and schedule you fairly quickly. I've never been scheduled more than a month out (except for Voca People, which is not even starting til the 16th. I'm doing that on the 27th)
I've also done Freud's Last Session, Rent, and MDQ there.
Updated On: 2/11/12 at 10:02 PM