The stage door for the Vivian Beaumont theater is trickier than others. First, find the box office, which is downstairs to the right if you are facing the bar in the lobby. Once you are at the box office, to the left, there is another set of stairs leading down, take that staircase. Once you get downstairs, exit the glass doors, and the stage door is on your left. The stage door is in-doors, sort of like in a big hallway, so if you find yourself out on the street, you have gone too far. Hopefully that description was helpful.
I just stage doored a few weeks ago, and it was a pleasant experience. Everyone was respectful. Ken Watanabe, Ruthie Ann Miles, and all the other cast members, were great, they were gracious and generous with their time. I was waiting for Kelli, but she did not come out to sign that day. After a bit over an hour, everyone left, so I left too... The show was great! Have a good time!