Disney World reveals Boo Bash Halloween Celebration If you're looking to spend Halloween at Disney World, the theme park has big plans for you. Hot on the heels of Disneyland opening in California, Walt Disney World has revealed how it'll be celebrating Halloween. While the park won't be doing its traditional Mickey's Not So Scary Halloween Party this year, it has lined up an alternative. Disney After Hours Boo Bash kicks off on August 10 and runs select nights through October 31, after Magic Kingdom closes. The event will give guests access to the parks, as well as the option to wear Halloween costumes--something you typically can't do in Disney's parks. Yes, you'll still have to wear masks and comply with the company's COVID guidelines.