I just got off the phone with them and they are in production on the following dates in April
April 11th & 12th, and 15th through 18th. These are probably not the only dates, just the ones that coincided with our vacation.
Some more information that may be helpful... kids have to be at least 5 to be in the audience and 9 to participate in the show. Tickets are given out at 1:00 on a first come first served basis and she suggested checking with guest services on arrival to get an idea when to line up.