If you dig into the Clubs spreadsheet on the ACA page it usually lists an email/website etc.
Let me know if you crack the code for getting with a team, I thinks its a pretty secret society. I did reach out last fall/spring. The responses I got ranged from no reply, no thanks, sign up for my coaching ($$) and I'll put you on the team, sign up for our team ($$) and we'll let you know when we are getting together and one actual here's an email of our 4 captain, send him a note and he will let you know when they are getting together for rides (Old SEAR, no Colorado Bike Law). I must have been dispirited by this point becuase I never followed up and did the indie thing again this past summer. I do think I will reach out again this fall to Co Bike Law. I think they start their weekend rides down near you.