DENVER, July 7, 2016 /PRNewswire/ -- Competitor Group, Inc. (CGI), organizers of the Rock 'n' Roll Marathon Series, today announced an expanded partnership with Transamerica as the new title sponsor of the Transamerica Rock 'n' Roll Denver Half Marathon. Colorado's premier half-marathon returns the weekend of October 15 – 16, featuring live bands performing along the route and a concert at the finish line.