At least 10 Freedom From Religion Foundation (FFRF) dues-paying members are needed in order to forma local chapter in Denver. If you would be interested in having such a group here in town (and why wouldn't you???), then come to the Virginia Village branch library (1500 S Dahlia St at East Florida Ave) on Saturday, January 12 to learn more, discuss what can happen, and get involved!
Note: This is not a Humanists of Colorado official meetup, but is being organized by someone else and I thought members of this group would be interested. If you have questions, I will do what I can to get you answers here on the comments. There is no need to indicate you won't be able to make it.