From the MU web site:

Ford Hi-Performance Vehicle Show - August 20 (no rain date)
Brought to you by Shelby American Automobile Club New England & Mustangs Unlimited
Registration: 9AM, Show starts at 10AM, $15 per vehicle, free guest admission
Contact info: Gene Koss: (860) 872-9225 or Jeff Conley: (860) 690-8406