No official release as of yet. Will likely be sometime next month with tickets going on sale around May 1. The Sept. park hours are already out and it is a pretty safe bet that the nights MK closes at 7pm will be a party night, but don't take that as 100% accurate as things can change between now and the official release.
The parties have always historically been held on Friday, Sunday, Tuesday and Thursday nights. The main questions are how early do they start and are they sticking to the same days.
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