FRIDAY — Pianist Youri Egorov and guest conductor Christopher Keene will appear with the Toledo Symphony in a subscription concert at 8:30 p.m. in the Toledo Masonic Auditorium. Egorov, Russian born and trained, has been a resident of Holland since 1976. Keene is music director and conductor of the Syracuse Symphony, the Long Island Philharmonic, and New York State ARTPARK. Fortickets call 381-8851.SATURDAY — The Toledo Symphony will present a concert at 8:30 p.m. in the Peristyle of the Toledo Museum of Art. Appearing with the orchestra will be pianist Youri Egorov and guest conductor Christopher Keene. For tickets call 381-8851.