Bring a picnic and a blanket and enjoy the Chamber Music Society of North Jersey string quartet playing under the historic Olmsted Oak in Anderson Park. Works include Schubert’s “Death and the Maiden” and Haydn’s Quartet Op. 33, No. 3 (“The Bird”). FREE. Sponsored by Friends of Anderson Park, Essex County Department of Parks, Recreation and Cultural Affairs, and the Bravitas Group/Silver Family Foundation. (Raindate, June 9, same time.) (Check the Friends of Anderson Park Facebook page for weather updates.)