We have stayed in prior trips in Oct during this holiday. In the past, it was a very busy week and weekend.
We felt it was more crowded than our June trips as there was so much going on at that time. F&W and the Halloween parties used to draw huge crowds. One school in Arizona had that entire week off, for a fall break (my nephews school).
I am not sure what this year is going to look like, I am sure it will not be the same crowds as the past.