For any others at WDW on 9/20, they just announced an after hours event that day:
https://disneyparks.disney.go.com/b...s-dates-now-available-for-magic-kingdom-park/ If you link to the event page, the Sept date doesn't show, but I just booked it so I know it does in fact exist in the system.
I have been trying to do one of these for two years, so I am excited it is happening for this visit. I guess it might help narrow down park hours for that date, too, since it starts at 9PM. It is a little crazy planning with the
MNSSHP and the after hours event that week. Luckily the after hours event starts at 9, which is after the current closing time (8PM) and the hours for the park last year (9PM), so I don't think it should screw up plans for those visiting that day.