Hi Kerri! Your excitement is contagious -- I'm giddy just thinking about all the fun you're going to have on your Walt Disney World vacation!
The Hollywood Studios park calendar can be found at
https://disneyworld.disney.go.com/calendars/hollywood-studios/#timeofday=allday . Just click the calendar icon next to the month at the top of the screen and then use the arrows to advance to the date of your vacation to see the daily schedule for Fantasmic and other shows in the park.
I checked the calendar for your dates, and Fantasmic is scheduled for each night at 9 p.m. Plan to dine around 6 p.m. so you can have a leisurely meal and still have plenty of time to line up for the show. If you're willing to eat a little earlier, consider booking a
Fantasmic Dining Package at Mama Melrose's, which will give you a VIP voucher for seating at the show so you don't have to line up quite so early, and that way, you can take in a few attractions after dinner.
Wishing you a magical vacation! Come visit us again at the Moms Panel if you have more questions! We'd love to help!