One of the best Disney decisions I have made is going to Mickey's Halloween Party. It was fabulous. We went on a weeknight, and you could enter the park three hours before the beginning of the event. If you want to enter the park more than three hours prior to the party you have to pay for a day pass along with your Halloween party ticket. Our particular event started at 6:00, so we could enter the park at 3:00. You are given a wrist band that must be worn to show you are attending the party. Park employees usher out all patrons that don't have a wrist band before the party starts. One of the greatest parts of Mickey's Halloween Party is that only a certain number of tickets are sold for each night, so you have the opportunity to do a lot of things even though it is only a five hour party.