BRUNSWICK – The Bowdoin International Music Festival tonight will feature 2005 van Cliburn award-winning pianist Sa Chen; soprano Lisa Graf of Newcastle and Aachen, Germany; and Joshua Smith, principal flutist of the Cleveland Orchestra. This is the season finale. Also appearing will be festival students and faculty, performing works by Poulenc, Schumann, Shostakovich, and Beethoven. The concert will begin at 8 p.m. in Crooker Theatre at Brunswick High School. Tickets: $25. FMI: 725-3895; www.bowdoinfestival.org.