If you're talking about where to buy tickets, they're not at the Poly. They're at the Contemporary, on the third floor in the wing...darn! I can't remember which one--but it's the one on the left as you're looking at the front of the resort from the parking lot.
When you get off the elevator take a right down the corridor and you'll come right to it. It's in a regular room, but the door is open so it's easy to find.
There is a sign as you come off the elevator, but we missed it and ended up asking someone from Housekeeping. She was really sweet and pointed us in the right direction. We saw the sign as we were leaving and felt just a little stupid.