Castle Rock 5th Annual Downtown Summer Car Show 6/15/13 10am - 3pm
Show Flyer
http://www.classicrockcruisein.com/
Registration form
http://www.classicrockcruisein.com/Cruise%20In%20Registration%20Form%202013.pdf

This looks like fun and a good location to get everyone together.

http://www.cardomain.com/ride/2619515