We spent Saturday October 7 in the MK for the same reason, to see HEA. Touring Plans predicted a 6/10, ended up being a 10/10. Not sure what date you are looking at, but this was the Saturday before Columbus Day. It was VERY busy but we arrived early, 7:15 AM for 8:00 opening (it was not EMH, the park just opened at 8 that day). We had Tomorrowland to ourselves for over an hour (not literally, but it felt so empty). Crowds built up around 9:30. With the early arrival, use of FP+, willingness to wait in some lines, and a nice relaxing lunch at Crystal Palace it was a good morning. We lined up around 1pm for the 2pm Festival of Fantasy parade in a shady spot in Frontierland. Then took a break at the hotel and returned for HEA -- we booked the dessert party with garden viewing so once again avoided the crowds. It was a good day for us.

I would definitely try to see it!