Depending on when in October, there could be some (Fall Break), but even if there are "more" kids that week than usual in fall, it definitely won't be anywhere near as many as in the summer.
We'll be on Harmony Oct 2-9 because that's when my kids and I have Fall Break, but I know that Fall Break isn't a thing everywhere, so I expect that kid numbers will be comparatively lower, although obviously not nonexistent.
But summer is obviously packed with kids.