I went to the Michigan one as well. Do not remember what year (years?) that was. Milan Dragway, right?
1985: Friday was at a hotel in Ann Arbor IIRC (Hilton?) Car show in the parking lot Saturday was at Milan Dragway...my first time ever at that track...it was a blast! Sunday was at the Chrysler proving grounds in Chelsea, not too far from the previous two days events.