In the cycling club I was a member of in North Carolina, there were riders of all speeds, so don't let that stop you. There were a lot of slower riders who rode together a lot and became good friends. Most rides will be advertised to be of a certain pace or will break into two or more groups, so obviously don't go to an "A" paced ride if you are slow, but if it's a B-C type ride, it will usually break into several groups, and some people will almost always be around the same pace as you. I had many great conversations and met some great women friends that way. There was also a women-only ride that was fun.
What other interests do you have? Perhaps there are other clubs, organizations, or groups you could join, attend meetings, etc. From book clubs to dining clubs to whatever...I would be surprised if a big city like Denver didn't offer numerous ways to meet people. But you have to get out there -- that's the hardest part. And be patient -- you've only been there a month.
Emily
2011 Jamis Dakar XC "Toto" - Selle Italia Ldy Gel Flow
2007 Trek Pilot 5.0 WSD "Gloria" - Selle Italia Diva Gel Flow
2004 Bike Friday Petite Pocket Crusoe - Selle Italia Diva Gel Flow