I am gonna be honest... October can be a crazy busy month for several reasons. There's the Mickey's Trick or treat party which is an event which happens randomly through the month. The Haunted Mansion opens with the "Night Mare before Xmas" theme, and also the first weekend in October is "Gay Days" where the Gay and Les can take their families to the park. They wear the color red to promote their event, and so if you have issues against this kind of thing you may want to reconsider. Gay Days this year is from October 1-3rd so anytime after that might be good. The bonus of this time of year though is that you can catch the Halloween fireworks, and the Characters are plentiful!
But the earlier you go in October the better off your going to be. Or wait until November when things can calm down a bit and you might start catching some of the Christmas decorations going up.