The tv show World Harmony: Can It Happen? tapes at 6 p.m., Friday, May 4. The topic is "A Psychiatrist Looks at the World and Suggests How We Could Make It a Better Place in Which to Live." The guest panelist will be Dr. David A. Ruben. Arrive in Studio A by 5:45 p.m. to guarantee seating. The show rebroadcasts on Cox Digital Channel 120 and Comcast Channel 72. For more information, call 722-2837.