We attended the 22 Sept party and was pleasantly surprised to find that there were many more people dressed in costumes than we had expected. Some were simple, others more elaborate, but it was fun to see.
You can enter with your party ticket at 4pm and wear your costume. The party starts at 7pm (music changes, they start the candy lines, shows, sweeping non-party goers, etc) but many show up at 4pm. We sat outside of the MK on our non-park day one afternoon and watched as people came in, dressed in their costumes.Question for those adults dressing up - Can you dress up if you're entering the park at 4 PM? I know Disney's policy is that adults can only dress up during the Halloween Party. We are planning on using our party tickets that day to enter at 4, and wasn't sure if we should bring our costumes to change into at 7.
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