October is busy for the Halloween events.
Check out this thread for park events and school holiday/breaks too
http://www.disboards.com/threads/2017-calendar-of-events-school-breaks-and-dlr.3528760/
We've been during GayDays and the parks were very busy.
We've also been during Columbus Day holiday and we were shocked how busy it was.
There really isn't a slow time in the parks these days. I hear the only thing that keeps the crowds down is rain/bad weather.
Geemo