Predicting closures and refurbishments is a little like predicting the weather...it's hard to say and it can change with very little notice. Typically (although this can also change), during the non-peak periods, fireworks and select other nighttime entertainment (e.g., F!, but assume the new show had debut, it's not yet known what kind of schedule it will have) is only offered on Fri through Sun nights (WoC is usually nightly, unless it's down which isn't that common). There will probably be some attraction closures (it's seems fairly rare to have a period when nothing is closed during the non-peak periods), but they probably won't announce an initially planned closures until much closer to the date (~45-days in advance, when the calendar is posted).
Just in case...by mid-September, Haunted Mansion and Space Mtn may both have their HalloweenTime overlays in place; it all depends on when HalloweenTime starts (assuming both return this year). They haven't made any HalloweenTime announcements (yet); that will probably come in mid-summer. It's something to keep in mind if you wanted to see the "classic" versions of both attractions.