Hi Tina,
The nighttime spectaculars at Walt Disney World are truly amazing. The fireworks, music, and storytelling together are unbelievable.
There are three main nighttime spectaculars at Walt Disney World. These are
Wishes Nighttime Spectacular at Magic Kingdom,
IllumiNations: Reflections of Earth at Epcot, and
Symphony in the Stars: A Galactic Spectacular at Disney's Hollywood Studios. The times for these shows can vary. I recommend that you go to the links that I provided and select the date that you are interested in on the calendar to find out the time that the show starts. For example, since you are going at the end of March, I chose March 29 and see that Wishes: Nighttime Spectacular and IllumiNations: Reflections of Earth are showing at 9:00 p.m., and Symphony in the Stars: A Galactic Spectacular is showing at 9:15 p.m. These times may adjust a bit as you get closer to your vacation, so be sure to double check them when you arrive at Walt Disney World.
Do not forget that there are other amazing nighttime entertainment options before the fireworks, including the
Main Street Electrical Parade at Magic Kingdom and
Fantasmic! at Disney's Hollywood Studios. These are typically timed so that you can take in these shows as well as the nighttime fireworks spectaculars.
Please do let us know if you have any further questions, Tina!