All-Mopar show in Salem, Oregon

I just came back from showing my Dart in the All-Mopar event in Salem. I have attended this event for 4 years. The numbers were down this year. I am guessing we had a decrease of 30-35% from 2005. I am not aware of any conflicts for Mopars. What is causing this slide in participation? How are the numbers at other events, nationwide?