Abner Mikva, former chief justice, U.S. Court of Appeals for the District of Columbia Circuit, will moderate a conversation between civil-rights activists Alexander Polikoff and Bill Taylor on Wed., July 19, at 6 p.m. at the Harold Washington Library Center, 400 S. State. Call 312-747-4053 or e-mail lbelder@chicagopubliclibrary.org.