I don't remember if this was common in previous years but, the 2019 calendar shows that the park is closed weekdays from Aug 19-Aug 29 (maybe private events??). I always thought the park continued with full operations until Labor Day at which point they would close for 2 weeks to prep for Haunt. The waterpark, on the other hand, has, I believe, been closed on weekdays in the 2 weeks preceding Labor Day for several years now.