We really do not have any history to look upon. Most weeks Monday's seem to be a busy day at Epic (but then Labor Day Monday was probably to slowest day since opening -- there have been some recent weeks when it seemed the crowds showed up on WED -- the way they sold tickets with folks getting multi-days at the North campus with just one day at Epic does seem to cause some odd crowding one day of the week over others.
The thing that should/could push up Monday and Tuesday during HHN is that there is a crowd base that visits every year during HHN season, that is when they come and they do stay for multiple days -- I would guess many of these folks will make their first Epic visit this year.
Another unknown is how bad the tourism downturn is (by me anyway, I assume UNI has data around bookings and such). One can see it in destination cities like Las Vegas. Stories I have seen in the Orlando area believe that Epic helped compensate for the downturn by still drawing good international numbers compensating for the loss in folks not visiting the US this year, but how long will that last?!?
Personally, I think it is anyone's guess and I think it will be more determined by how many non HHN fans go to Epic, but it would make sense for them to go to Epic on an HHN night -- I wonder if Monsters would see an uptick in wait times ;-)