Just came in here to post this and you beat me to it!
We are there about the same time, I'm going to try to get tickets for my wife and daughter to see either Jessie or Liv and Maddie through the tvtickets.com site. Their schedules only go out 30 days, so I have to wait until early October to start checking for shows. I'd love to hear a trip report from anyone who has actually done this, though.
EDIT: Found
one review of Jessie.