First Friday Art Walk, a free, self-guided tour of historic Marietta Square’s eclectic art scene.  Art galleries, museums, cultural venues, restaurants and boutiques hosting artists within their businesses will display an Art Walk banner in their window.  Maps available at each participating location and at the Marietta Welcome Center.  5-9pm, rain or shine.  Historic Marietta Square.  More info:  www.artwalkmarietta.com.