Among other theme parks, Walt Disney World's Magic Kingdom stages a special separate admission event after regular park hours called Mickey's Not-So-Scary Halloween Party featuring a parade, stage show featuring Disney villains and a Happy HalloWishes fireworks show with a Halloween theme, while their sibling park in California, Disneyland Resort, holds Mickey's Trick-or-Treat Party at their California Adventure park. The Universal Studios theme parks in Hollywood and Orlando also feature annual Halloween events, dubbed Halloween Horror Nights. The Six Flags amusement parks also have Halloween events called Fright Fest in which visitors enjoy redecorated rides, Adult Halloween Costumes costumed goals, special shows and more. Busch Gardens Howl-O-Scream Tampa Bay and Busch Gardens Howl-O-Scream Williamsburg also host a few weeks of Halloween-themed fun. There are many haunted houses each with a different theme, "scare zones" where costumed performers scare random passerby, live shows, special themed food and much more.
Halloween was perceived as the night during which the division between the world of the living and the otherworld was blurred so spirits of the dead and inhabitants from the underworld were able to walk free on the earth. It was believed necessary to dress as a spirit or otherworldly creature when venturing outdoors to blend in, and this is where dressing in such a manner for Halloween comes from. This gradually evolved into trick-or-treating because children would knock on their neighbours' doors, in order to gather fruit, nuts, and sweets for the Halloween festival. Salt was once sprinkled in the hair of the children to protect against evil spirits.