It really won't known until mid Summer. September is mostly offeason while the other months are semi offseason so they get less rehabs.
The ones that happen regularily are, HM goes down for about 3 week in the first half of September for its holiday overlay. Mark Twain often gets a deck oiling for a midweek in September. Space Closes for about a midweek in early/mis September for it's Halloween overlay.
In late October Small World Close for about 3 weeks, opening mid November with it's Holiday Overlay.
In early November Space closes to remove it's overlay for a few days.