Today Disney Said that they will be testing Happily Ever After fireworks tonight at the Magic Kingdom after park close. There will be no viewing for guests from inside Magic Kingdom park. Walt Disney World Resort will host a second after hours test of Happily Ever After on June 29th for Cast Member previews. Here is the Offical statement.
Put on your favorite pajamas, cozy up and look to the skies! Tonight and Tuesday, June 29, after regular park hours, neighbors and resort guests near Magic Kingdom Park may hear a familiar sound as we test our fireworks before their official debut on July 1. We understand the evening noise impacts may not be ideal and sincerely apologize for any inconvenience this may cause to your routines. We hope you enjoy the show!
**PRO TIP: For the complete viewing experience, don’t forget the music! 
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Walt Disney World Resort
Fireworks return for guests to the Walt Disney World resort on July 1 2021 when both Happily Ever After and Epcot Forever return for the first time since March 2020.