The American Historic Racing Motorcycle Association will be racing at Gingerman Raceway Memorial Day Weekend. I know for sure there will be at least two SOCH CB 750's, possibly more. There may also be a CB 400 and a seriously tweaked CB 550.
In addition to those bikes there will be many other old bikes running around the track. Admission is something like $10. Practice session Friday night, racing Saturday and Sunday. If you decide to some out look for the CB 750 with a white tank/red racing stripe, #753. Say hi. Catch me after the races and have a beer.
-Big Bob