If you're looking for Cobra events try this one:
http://home.netcom.com/~abockman/mhc...ruisecolorado/
A couple of us from the Portland area go over for it (this year will be my 4th time) and it's a total blast if you can take the time off.
Usually 15 or so cars with some coming up from Texas as well. Last year was about 1200 miles over 6 days. My wife flies over and meets me in Denver while I trailer the car (2 days over and 2 back).
A fantastic run with really great people and scenery that will blow your socks off.
DonC