Magician and endurance artist David Blaine will appear on April 16, and presumably, he won't then disappear from the Landmark Theater during his visit to the Richmond Forum. Blaine's been buried alive for seven days, encased in ice in Times Square for three days and survived on water alone for 44 days while suspended over the Thames River. The title of his talk: "Does the Human Body Have Limits?" For Blaine, apparently it doesn't. 330-3993 or richmondforum.org .