Halloween is late enough in October that you miss all the fall breaks (depending on actual day of Halloween.) We have always gone Nov 1st +/- day and it's never been too crowded. This year, we were there ON halloween which was phenomenal. SM was standby 15 minutes, all day. Crazy. Especially with maxpass, I don't think we waited in line for anything. Monday was more crowded but not terrible, Wednesday was ok too. I think especially if Halloween is a school day, anybody that goes Halloween day is going to likely be going to the party itself and not everyone can swing both. $120/person for the party, but that was also phenomenal. Ride lines were non-existent, treat lines went quickly. Parade spots did fill up pretty fast for 9pm parade.