The Pearl Street Gallery in Chelsea hosted a party on Saturday night for the opening of “FOOD,” an exhibition featuring renderings of edible things. Guests included Darlene DeVita and her dog Lucy (pictured), who checked out “Hello Cupcake,” an oil on canvas by Arnie Casavant. DeVita also runs a Chelsea gallery — the Gallery at Spencer Lofts — which, like Pearl Street, was a part of the city’s annual Art Walk on Saturday and Sunday.