Friends of Hollin Hills, a new 501(c)(3) non-profit organization dedicated to preserving and enhancing the Charles M. Goodman-designed Hollin Hills Historic District, is holding its first event this Sunday, March 4, from 4 to 6 pm. The panel of local architects and contractors will discuss questions related to “Efficient Modernism,” such as how to insulate mid-century modern homes and whether single pane windows be replaced.  The event will be held at Hollin Hall, Mount Vernon Unitarian Church. The event will start with wine and cheese from 4 to 5 pm and the panel will be held 5-6 pm. Please RSVP for planning purposes by emailing friendsofhollinhills@gmail.com.