The Lansdowne Symphony Orchestra wraps up its season with an evening dedicated to the music of Tchaikovsky. $15; $12 seniors; $5 students. E.T. Richardson Middle School, 20 W. Woodland Ave., Springfield. 3 p.m. www.lansdowneso.org; 610-284-3719.
The new Mid-Atlantic Peony Society explores the Scott Arboretum Tree Peony collection. Jeff Jabco, coordinator of horticulture, discusses the more than 200 tree peonies at the arboretum. Free. 500 College Ave., Swarthmore. 6 p.m. 610-358-1321.
Walk for a cause
Join the Walk 4Hearing at Ridley Creek State Park with the Hearing Discovery Center. The walk helps raise public awareness of hearing loss and promotes educational programs. Free. 1023 Sycamore Mills Rd., Media. 9 a.m. www.walk4hearing.org; 610-237-6222, Ext. 56.