There have been articles mentioning that Halloween events are making parks a lot of money during that one month when they were otherwise closed up here due to the cold. GAdv's Fright Fest crowds seem much worse than the regular summer crowds at times, and Dorney's likely seeing a nice bump in attendance and income as well. Knott's and Universal spend a ton of money for their events and from what I've heard actually sell out the park's capacity for most of the Saturdays of that month. I've forgotten where I read it, but I have heard that many small parks see roughly half of their year's income for that one month now. True or not, you can't deny that the crowds have been pretty heavy for the parks during that time, so they would be stupid not to cater to those crowds wanting to spend more money at the parks.