The summer hotboat weekends at Marble Lake are the ultimate shine-and-show family events, and they get very little showing from the usual Michigan Hot Boaters. Dale, the owner of Corn Island, is a fantastic event host. He does it for the love of the lake. There's plenty of clear area for grilling, lots of shallow-water sandy bottom parking, and a good family atmosphere. If you want to sit on your ass and drink beer that's fine. If you want to stay sober and burn some alcohol instead, it's 100% legal, with no restriction on noise or speed within the course. There's good launch parking, lots of speed photo opps at the sandbar, and a great chain of lakes to run on.
There's permits for a multitude of Friday evening grudge races. No sanctioning, no rules, just a good time. The Saturday events last all-day long.