The Denver Parks and Recreation have spoken
and there will be no NEW run/race/walk or bikes rides in 2014. The website doesn't really state the reason why, only that "it's necessary in order for the city to provide the best possible experience for those recurring events we currently permit on an annual basis." I have no idea what that means.
What I do know is that if you put on a race in 2013 in Denver, this will reduce your competition. Races come and go and the number of races that were being put on in the Denver parks were numerous, which begs the question were they too numerous?