Grafenberg Justin Franzen 1223 21st St Denver, CO, United States 80205 About Troupes 7 Members 28 Training About Grafenberg Grafenberg is an improv and sketch comedy theater in Denver. We offer jams, shows and classes. top ↑ Login to this site requires ssl communication.Click here to reload the page over ssl. Username: Password: Don't have an account? Lost your password? Choose username: Your Email: Have an account? Enter your username or email: Back to login Who’s Online There are no users currently online Recent Posts Rehearsal: Making It Work For Your Team Please Consider Donating Digital Entertainment Venue Being Built (But Why?) Marcus Sams – Our New Board Member Producing Your Own Improv Show Yes And...