If you are not in the park, its the main entrance gate. If you are inside the park before the party during the normal operating day, there will be a designated area for check in or purchasing tickets. - BaseballMickey_CM  2851.3 #15 10:27PM

Ok. So , Mickey Halloween party has its own open gates for the event. They usually have it open on the far right side closes to the stroller rental. All you do is show your tickets at the gate for the event. They will give you a wristband and small trick or treat bag. This wristband will allow you to get on rides and do the trick or treats stations. Reason for the wristband is to allow cast members at the entrance of the rides and trick or treat stations to know who belongs at the event. In addition, the general public are slowly forced to leave the park, since they can no longer get on rides. Lastly, they do ask a lot in the beginning of the event to show the wristband before entering the lines, but never take them off. By the way, you should be able to go on the rides multiple times and get tons of candy. Make sure you bring your pillow case or a huge trick or treat bag; it will came in handy for the candies. And enjoy! - ToyStoryVSLittleMermaid  3.9 #14339 11:26PM