Hi Lee

Fantasmic is a great show. I believe in peak season they put on 2 shows per evening but not sure if it is on every evening. Check with Disney for days/times. I would suggest going to later show as your kids are that bit older and it may be less busy. Would also recommend doing the dinner package - see extract below from Disney website:

"During the holidays and peak season, take advantage of the second showing of "Fantasmic!" It's typically easier to get a seat.

For a "Fantasmic! Dining Experience," make priority seating arrangements at the Guest Information Board at Hollywood Junction or in person at one of the participating restaurants. After dinner, you'll receive a voucher for VIP show seating."

Sandra