The 7th annual Mark Vann Foundation Holiday Benefit Concert will be held on Saturday, Dec. 5, at Boulder Theater, and Island attire is encouraged. This year’s concert will feature Great American Taxi and Friends, Fuforquestra, Keith Mosley of String Cheese Incident, Elephant Revival, Tim Carbone of Railroad Earth, and the Black Swan Singers. There will be a few surprises and special guests, as well.