The Chamber Music Festival of Saugatuck reaches the end of its 31st season this week with concerts on Thursday and Friday at 7:30 pm in the Woman's Club of Saugatuck. Returning as a key player is Alicia Eppinga, the principal cellist of the Grand Rapids Symphony Orchestra. She begins the program with the Cello Sonata Op 19 by Sergei Rachmaninov, a work which, while beautiful, brings up a sensitive issue for cellists seeking accompanists - the piano part is notoriously difficult. Luckily for her, she says, pianist Drew Le suggested they play it. The rest of the program features famous works of Edvard Grieg - the Peer Gynt Suite No. 1 and the Holberg Suite - arranged for eleven strings by Adam Liebert, another Grand Rapids Symphony member and a performer at the Chamber Music Festival of Saugatuck.