By Helen Epstein 1) Nov 2: This Monday’s free concert at Jordan Hall celebrates Eastern European composers and players. The unusual musical line-up includes the Haydn Piano Trio in E minor, the Boston premiere of Kati Agócs’s “Awakening Galatea,” Bacewicz’s “Suite for Two Violins,” and Dvorak’s Piano Quintet in A Major, Opus 81. Performance starts…