Hi Ashley,
You must be so excited for your upcoming vacation! The times for both Illuminations and Fantasmic! are set, and you can find that information by going to the
calendar for each park and clicking on a specific date.
I've checked out the information for you, and Fantasmic! is being performed on the following nights:
Sunday, July 18 - 9:00 PM
Tuesday, July 20 - 9:00 PM
Thursday, July 22 - 9:00 PM
Illuminations can be seen nightly at 9:00 PM.
Hope this helps. Have a magical vacation!