Art: Dialog: Denver The works of 16 local artists reflect upon the Democratic National Convention. Robischon Gallery, 1740 Wazee St., 303-298-7788. www.dialogcity.org. 6-8 p.m. Through Sept. 20. Comedy: Hippieman's Plan for America This long-haired comic throws everyday politics out the door and has his own very funny plan for the future of America. Comedy Works Larimer Square, 1226 15th St., www.comedyworks.com. 8 p.m. Also, Aug. 23-24. Exhibit: 1908--When the Democrats First Came to Denver The Denver Public Library and Colorado Historical Society display photographs, cartoons, and newspapers from Denver's 1908 Democratic National Convention. Denver Public Library Central Branch, 100 W. 14th Ave. Pkwy., 7th floor. www.denverlibrary.org. Daily, times vary. Through Oct. 31.