Photo by Connie Oswald Stofko Artisans and vendors are sought for the 13th annual Gardens Buffalo Niagara Garden Art Sale to be held 10 a.m. to 4 p.m. Saturday, June 29 and 10 a.m. to 3 p.m. Sunday, June 30 at the Buffalo & Erie County Botanical Gardens, 2655 South Park Ave., Buffalo. The event welcomes diverse mediums including sculptures, planters, metalwork, fountains, wind sculptures, vintage signs, ceramics, woodwork, birdhouses, birdbaths and more. “This is an exceptional opportunity for artists and…