They do close early for private events from time to time.
During October, the park will close one night early for the Cast Member (Little Monsters) Halloween Party. when I went the past few years, it was later on in the month. Not sure if they bumped up the date this year, or if there is a separate event.
So if I'm reading the park hours schedule correctly, DL is actually closing early 3 days that week of Sept 28th: 6 PM on Tues and 7 PM on Fri for MHP, and 6 PM on Weds, Oct 1st for some kind of unknown special event.
Bummer for those folks who at DL that week especially if they are not going to either of the Halloween parties.
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