This is a pretty big car show at the Fairfield county fairgrounds in Lancaster and starts out with a cruise down 33 from Ricart to the fairgrounds in Lancaster. I went last year and it was mostly classics and quite a few ricers. It'd be nice to get a big group of newer Mustangs at this thing. Here's a link:
http://www.earthangelfoundation.org/events.htm
http://www.earthangelfoundation.org/events.htm