Hi Grace,
Sorry for the confusion. There have been some recent changes and upgrades to WDW's website and as sometimes happens with something new, there have been some kinks to work out. You can find a listing of the parade and fireworks schedule, as wel as Fantasmic viewing times by going
here. I took a quick peek, and for the dates you gave, Fantasmic is currently scheduled for March 22, 25 and 26th, will all shows at 8:30pm.
I always suggest booking a Fantasmic dinner package. If you are not familiar with this, you choose from one of three Hollywood Studios dining locations, Brown Derby, Hollywood and Vine, or Mama Melrose. After dinner, you will receive a voucher that is good for entrance into a reserved section of seats for the Fantasmic show. While this voucher does not guarantee the location of the seats, it is for entry into a section not available to the general public and therefore will eliminate the need for you to stand in the long entrance lines. You can reserve this package by calling 407-WDW-DINE or 407-939-3463.
Hope you have a magical trip!