Strolling at the Gaithersburg Rio Basic event infoEvent date: 12/18/2021 - 1:30pm to 2:30pmLocation: Gaithersburg Rio 9811 Washingtonian Blvd 20878 Gaithersburg , MD United States See map: Google Maps Maryland US Public event fieldsHarmony Express is glad to be back celebrating the holidays at the Gaithersburg Rio, singing at various spots outdoors at the Rio. Come on out!