Looks like Plymouth Speedway will be running some specials wing and non wing 600 shows throughout the season on their Bullring dirt track. Look at their website
www.plymouthspeedway.net. I know their first show is a wing show with SOD on june 16th when Tony Stewart is coming in to run. And it looks like the second show will be non wing 600s with the USAC midgets on saturday July 7th for the Plymouth Palooza.