Internationally acclaimed conductor Kent Nagano will conduct the San Francisco Academy Orchestra in a gala performance celebrating Alden Gilchrist’s 60th year as director of music at S.F.’s Calvary Presbyterian Church, 2515 Fillmore St. (at Jackson) at 6 p.m. A reception will follow. Concert will include excerpts from Gilchrist’s cantata and works by Mozart, Dvorak, Monteverdi and J. S. Bach performed by the Academy Orchestra, The Calvary Chancel Choir and Soloists and the Santa Rosa Children’s Chorus. Event is free, but RSVP requested: (415) 346-3832, ext. 60. Info gilchrist60@calvarypresbyterian.org.