Thursday is Natick's annual Art Walk, when downtown businesses and art galleries open their doors to display the works of numerous artists for visitors. The event runs from 5:30 to 9 p.m., and encompasses businesses and locations on Main, South, Main, West Central, Pond, Summer, and Adams streets, and South Avenue. Among the artists represented will be painters, jewelry makers, photographers, fiber artists, a woodworker, and sculptors. A downloadable map with information about artists and art demonstrations is available at www.natickcenter.org .