It's just a bit too far for me to tote a game across the lake on a Sunday and while I would love to take the occasional class, if they are not on the web, distance is a problem again.
What about a pinball repair and restoration conference? I would pay shiny coin for that and swim across lake Michigan if necessary.
Maybe a day or two of sessions culminating in one of the museums open weekends?
In my dreams, topics would be as simple as setting a machine up properly, to as complicated as basic board repair and everything in between.