Seeing as how you are posting this on RME, I'm guessing you're not only looking for dedicated short course trucks or 500+hp Ultra4 cars to come out.
So who are you targeting this to?
I have always thought it would be fun to bring our jeep out there, at least for fun and to try to dial in our suspension a little better, but... Our sweet 190 hp I6 on 40s wouldn't scoot around the track very quick, and we would probably just get in the way.
I guess more explanation as to what the event actually is, as well as explaining the classes better might get more response than just posting on RME asking who is coming. Also, where are the pictures/videos from previous events? Get some excitement built up about it and you might see more people out there.