Fourteenth Annual Seminar: Wagner/Strauss. Speakers: Leon Botstein, Ph.D., Prof. Bryan Gilliam, Joe Pearce, Erick Neher (slide presentation), Maestro Valery Gergiev (surprise guest speaker); Robert J. Sweeney, moderator. Met principals: Hildegard Behrens, James King, Wolfgang Schmidt; Ingrid Budde (translator). William Sherman Public School 87 (160 West 78th Street); Sunday, 12:00 noon-5:00p.m.