Follower to this site, Ryan Fonkert, tipped me off to the Gold Belt Century.
Ryan commented on a post:
"I took part in this one last year; a great ride. It, too, is more of a social affair; not really a race, per se. Still, if you're just looking to get in some great gravel miles with great folks, check it out. I had a blast. There were only 5 of us last year, and I was the only one from the Springs area. I was really surprised by that, as it's a great ride right here in our backyard."
While I haven't actually met Ryan other that out in electronic land, he seems like he probably wouldn't lie. So, if you are looking for a good ride on June 10, look into the Gold Belt.
*Side note: I will definitely not be there because we have a son due in June.... Have fun people!