I'm not in the Midwest but I have a suggestion. Develop a name for the event. Here in Southern California, we have a Spring Fling and a Fall Fling that are Mopars only. We also have other events such as The Good Guys Orange County Get Together that is open to all makes and models. Other specific makes have their own event names. Of course, there is always Mopars At The Strip in Las Vegas in March where you can show and race your car.