‘Disney After Hours BOO BASH’ scaring up fun at Magic Kingdom New Halloween event begins Aug. 10 Updated: Tags: This Halloween season, something special is brewing for Magic Kingdom Park at Walt Disney World Resort in Lake Buena Vista, Fla. “Disney After Hours BOO BASH” will be a three-hour event that begins when the park closes on select nights from Aug. 10 through Oct. 31. (Walt Disney World) ORLANDO, Fla. – Walt Disney World announced Friday the all-new Halloween event coming to Magic Kingdom theme park, “Disney After Hours BOO BASH.” The event begins Aug. 10 and will run through Halloween night. [TRENDING: ] Disney said guests will see spooky festivities, including Halloween-themed cavalcades, character sightings, special performances by the Cadaver Dans, décor, lighting, music, treat stops with plenty of candy.