James Conlon, music director of the CSO residency at Ravinia, settles in for the season with a program focusing on works by Hanns Eisler and Erich Korngold, two composers who found success after fleeing Nazi persecution, on July 22. The Martin Theatre concert with soloists from the CSO features the Ravinia premieres of Eisler’s Fourteen Ways of Describing Rain, accompanied by the silent film Regen (Rain), and Korngold’s String Sextet in D Major. The program also includes Wagner’sSiegfried Idyll.