The Worcester Art Museum, 55 Salisbury St., will hold holiday concerts in the museum’s Renaissance Court, Sunday, Dec. 10, with the Salisbury Singers, and Sunday, Dec. 17, featuring the Merrimack Valley Ringers. Concerts are free with museum admission. In the Higgins Education Wing, castles will take over as the museum presents “Brick by Brick: A Community Castle Exhibition” beginning Saturday, Dec. 9, through Sunday, Feb. 25. For more information, visit www.worcesterart.org.