presents its 25th anniversary summer international organ festival, on Monday evenings, 7:30 pm, from June 25 through August 27 at the Spreckels Organ Pavilion in Balboa Park: June 25, Robert Plimpton; July 2, Simon Gledhill; 7/9, Tom Trenney; 7/16, Ty Woodward; 7/23, Diane Bish; 7/30, Carlo Curley; August 6, Elizabeth & Raymond Chenault; 8/13, Gordon Turk; 8/20, Dennis James (silent movie); 8/27, Carol Williams and guests, festival grand finale. For information: 619/702-8138; The Spreckels Organ Societywww.sosorgan.com.