Jerry Weinstein displays his color photographs in "From Machu Picchu to the Galapagos." The exhibit, which portrays the ancient ruins of South America's Incan city, features photographs of Andean Indians engaged in centuries-old traditional activities and the evolving animals of the Galapagos Islands. It begins Monday and runs through Dec. 3. 10 a.m.-5 p.m. Mondays-Fridays, 9:30 a.m.-12:30 p.m. Saturdays, or by appointment. There will be a reception with the artist 6-8 p.m. Nov. 5. Artists' Gallery, American City Building, 10227 Wincopin Cir., Columbia. Free. 410-740-8249.
The Animal Welfare Society of Howard County will hold its third annual fundraising walk 9 a.m.-2 p.m. Sunday to benefit animals in need of care and shelter. The Halloween Rover Run Dog Walk will feature a canine costume contest, information on microchip identification, professional photos, obedience training and more. Register 8 a.m.-1 p.m. for the two-mile walk. Schooley Mill Park, 12975 Hall Shop Rd., Highland. Registration is $25 and includes a bandana, or $35 with a T-shirt. A contribution of $100 or more will include a microchip identification tag for your pet. 410-465-4350 or www.aws.petfinder.com.
The Chesapeake Shakespeare Company presents "Measure for Measure," a play about a young nun who is given a choice by a puritanical politician: her virtue or her brother's life. In the play, Shakespeare interweaves comedy with dark themes. 8 p.m. Fridays and Saturdays, through Nov. 6. Howard County Center for the Arts, 8510 High Ridge Rd., Ellicott City. $10. 410-752-3994 or www.chesapeakeshakespeare.com.