Hello, Beverly!
I am happy to report that you will find designated viewing areas for fireworks (parades and shows, too) for
Guests with Disabilities. At the bottom of the linked page, you can download a Guide for Guests with Disabilities for each theme park, which denotes viewing locations. In my experience, the areas allow the Guest using the wheelchair or ECV and one other member of the party to stay the viewing area, so there will be plenty of room for others who also wish to use the area. Viewing areas are easily identifiable with a banner depicting a wheelchair and fill on a first come, first serve basis. Last weekend I noticed a roped off area in front of Cinderella Castle where Guests could view
Wishes! Nighttime Spectacular and have a perfect view of the new castle projection show called
Once Upon a Time. Be sure you confirm the viewing locations once you arrive by stopping by Guest Relations, as areas can change without notice.
I hope you find the links helpful, and please visit us again should you have additional questions about your upcoming visit to Walt Disney World Resort.
Missy