A gem of the city’s cultural history, and a must-see for old-house lovers, is Westwood ($10, 3425 Kingston Pike, knoxheritage.org/westwood), the estate and former home of artist Adelia Armstrong Lutz. Last year, the National Trust for Historic Preservation listed the home in the Historic Artists’ Homes and Studios program. Music lovers won’t want to miss a performance at the Knoxville Opera ($15-$115, 612 E. Depot Ave., knoxvilleopera.org), where “The Marriage of Figaro” is set for April 28 and 30. Knoxville Visitor’s Center Center, 301 S. Gay St., 865-523-7263, www.visitknoxville.com Charlotte, North Carolina As the city’s slogan says, “Charlotte’s got a lot,” and lately, it’s been adding even more. Para restaurant…