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Addison Gallery of American Art, Phillips Academy -- 3 Chapel Ave, Andover. Seen and Unseen, Invisible Citings: Elaine Reichek and Jeanne Silverthorne, through Dec. 31; open Tues.-Sat., 10 a.m. to 5 p.m., and Sun. 1-5 p.m. Color and Light: Watercolors from the Collection, through Oct. 15.
Andover Historical Society -- 97 Main St. "Places": An Art Exhibit Inspired by Andover, runs through Dec. 22; visit andoverhistorical.org for specs. Hand Planes & Wireless Routers: Traditional Hand Woodworking Course, Saturdays, Oct. 14,21,28, Nov, 4,25, Dec. 2,9; 9 a.m.-noon; $60 members, $70 nonmembers, $40 students 17-plus.
Chelmsford Center for the Arts -- 1 North Road. Portals; hours are Sat. and Sun., 1-4 p.m., or by appointment. Get Yourself Painting, with artist-in-residence Trina Teele, basic concepts of drawing, color, value, light and composition; Mondays, Oct. 16,23,30 and Nov. 2, 10:30 a.m.-12:30 p.m. or 6:30-8:30 p.m.
Essex Art Center -- 56 Island St., Lawrence. Encuentro de Colores, through Oct. 20; open Mon.-Fri., 10 a.m.-6 p.m.; free; www.essexartcenter.com.
Gallery Z -- 167 Market St., Lowell. Artist Reception for Sophy Tuttle's "Evolution"; Sat., Oct. 14, 7-9 p.m.
High Five Arts -- Mill No. 5, 250 Jackson St., fifth floor. Tierna Tierra, sculptures and drawings by Estafania Puerta, through Sat.
Museum of Russian Icons -- 203 Union St, Clinton. Migration + Memory: Jewish Artists of the Russian and Soviet Empires, from the Vladimir and Vera Torchilin Collection; Fri. Oct. 13.
First Church of Christ, Congregational -- 25 Great Road, Bedford. 66th Annual Turkey Dinner, Sat., Oct. 14, 6-8 p.m.; $15 adult, $10 under 12; free under 2; 781-275-7951.
St. John's Church -- 115 Middlesex St., Chelmsford. Ham & Bean Supper; Sat., Oct. 21, 5-7 p.m.; $13 by Oct 15 at rectory, in church after weekend Masses, or at www.saintjohnchelmsford.org; 978-251-8571 or 978-649-3404.
First Parish Church -- 48 Main St., Westford. Community Christmas Chorus; rehearsals begin Sun., Oct. 22, 7 p.m., for Dec. 17 concert; adult and high-school ages; 978-692-8416.
Nara Park -- 25 Ledge Rock Way, Acton. Monster Bash; Fri., Oct. 20, 7-9 p.m.; $5; DJ, candy hunt (bring a flashlight), costumes optional.
Nashoba Valley Ski Area -- 79 Powers Road, Westford. Witch's Woods Haunted Hayride and Halloween Screampark. Thursday through Sunday through Oct. 31; $37, discount for 15 or more; tickets sold 6:30-10:30 p.m., park closes when the last visitor leaves; 978-692-3033, www.witchswoods.com.
United Methodist Church of Westford -- 10 Church St. Trunk-or-Treat & Chili Cook-off, Sun., Oct. 29, 4-6 p.m.; visit www.umcw.org.
Universalist Unitarian Church -- Chelmsford Center. Pumpkin Decorating Workshop, Mon. Oct. 16, 7-9 p.m.; bring your own pumpkin; $15 materials fee for nonmembers.