https://www.visitkingsisland.com/events/things-to-do/events-and-promotions/Coasterstock-at-Kings-Island Next year, May 16th - May 17th. Looks like it will be an event like CoasterMania at Cedar Point.
As I may have said before, all Haunt attractions may be removed this year. They're too scary. Replace them all with, I don't know, some roller coasters or something.