I live in Massachusetts now, but I used to live in Boulder. If you have time to be a tourist, the Pearl Street mall has lots of cute shops and restaurants. The place I miss the most in Johnny McGuire's, across the street from the University of Colorado. They have the best sandwiches in the world. My favorite was "The Julian," although "The Ranch Hand" was also pretty good.
Have a good time at the DNC. I hope all goes well.