Arlington: Feast of the East celebrates the East Arlington neighborhood’s restaurants, shops, businesses, and community organizations, with participants including Angelina’s Pastry, Capitol Creamery, Flora, Kathmandu Spice, Quebrada, Sabzi, and Something Sweet Without Wheat, and such activities as making sidewalk mandalas, tarot card readings, and face painting, Saturday from 11 a.m. to 3 p.m. along Massachusetts Avenue. www.capitolsq.com.
Waltham: The Waltham Riverfest features canoeing, kayaking, concerts, walks, dance events, lectures, visual art, and children’s activities Friday, 4:30 to 8:30 p.m., and Saturday, 9:30 a.m. to 8 p.m., in Landry Park, Cronin’s Landing, and Embassy Park. www.walthamriverfest.com.
Wrentham: “Meet Your Local Artists” will feature works by more than a dozen area residents from 10 a.m. to 5 p.m., and a 1 p.m. concert by Lonnie Gasperini, Saturday at the New England Artisan Gallery, 513 South St. (Route 1A). www.neartisangallery.com.
Arlington: Foggy Mountain Consort, featuring local residents Lauck Benson, Peter Lehman, Anne Goodwin, Art Schatz, and Doug Freundlich, will perform early music, ballads from the British Isles, bluegrass, and traditional North American tunes Saturday, 7:30 p.m., at St. John’s Coffeehouse, 74 Pleasant St. $15; $12 students and seniors. 781-648-4819, www.facebook.com/stjohnsconcerts.
Lexington: The Lexington Symphony’s Concert in the Round features the orchestra set up in the center of Cary Hall, with audience members encouraged to move to various locations between pieces in the informal performance, Saturday at 7 p.m. at 1605 Mass. Ave. The program will include string, woodwind, and brass ensembles performing Vivaldi’s Concerto for Four Violins, Stravinsky’s Octet for Winds, and Ravel’s Introduction and Allegro for Harp, Flute, and Clarinet. $40, $15 students. 781-523-9009, www.lexingtonsymphony.org.