It's not a convention in WDW. The NJ teachers have annual meetings every year (in NJ) about this time. Schools are not in session during the meetings (this year it's 11/7 &11/8), so many families choose to visit WDW at this time. Some even take their children out of school the entire week. FWIW, this year Veteran's Day (a Holiday for many) is on the following Monday (11/11).
The EPCOT resorts are especially popular during the Food & Wine Festival which runs from mid-October to just before Thanksgiving.
Even though the on site resorts are booked, it doesn't necessarily follow that the parks will be crowded. Unless the off-site bookings are strong and lots of "locals" choose to go that weekend, the parks may actually feel rather "empty" The WDW resorts alone cannot possibly "crowd" all four parks plus the waterparks, DD, and all the other attractions. IMHO, that's why Saturdays are so crowded at the MK.
Enjoy your trip!