Seasonal Songs at Washingtonian Center Rio Basic event infoEvent date: 12/21/2019 - 2:00pm to 3:00pmLocation: Washingtonian Center Rio Gaithersburg , MD United States See map: Google Maps Maryland US Public event fieldsHarmony Express Chorus is pleased to return to the Washingtonian Center Rio again this season. We will perform a selection of seasonal songs at several sites within the complex.