I hear they begin putting up the decorations in the MK at the end of August

It must take a while to do the entire park so that could be why they start doing it so early. It's probably as logistically complicated as the Christmas ones they put up in November

Having seen some of the photos on wdwinfo I can see the detail they include which makes it look stunning, no two pumkins look the same, and we can't wait to see it for ourselves this year. Looking forward to the
MNSSHP
I think the first party night is 4th September.