 At night, there is also Haunt Entertainment.Gazebo Stage and PEANUTS Showplace change every season or two, but as of 2018, Sinister Circus, an acrobat circus show, has been located in the Galaxy Theater.Halloween Haunt is a Halloween event at Valleyfair that was originally known as HalloWeekends, which operated from 1998 to 2000 on weekends in September.