Oogie Boogie Bash is five hours long. The party starts at 6PM and goes until 11PM. You can enter the park beginning at 3PM, but the actual party festivities do not start until 6PM. Use those extra three hours to enjoy some food, rides, shows, and character sightings that will not be available during the party hours. Or you can use that time to get in line for the lines for the most popular characters - up to you how you choose to use your time!