Milan still has one in the spring that I’m aware of. Bunch of guys up here in the thumb/tri city area with pretty decent/loud builds. I’m sure there is some downstate as well.
Based on what I've seen there is 1 show a year in Milan, the next closest shows would be Slamology in Indianapolis and a few Meca events in Columbus and various towns in southern Ohio. Michigan gets the shaft when it comes to events that are close by.