Montgomery County Agricultural Fair Basic event infoEvent date: Repeats every day every Monday and every Tuesday and every Wednesday and every Thursday and every Friday until Fri Aug 16 2024. 08/09/2024 - 6:00pm to 10:00pmLocation: Montgomery County Fairgrounds Gaithersburg , MD United States See map: Google Maps Maryland US Public event fieldsLook for Harmony Express barbershop singers strolling throughout the Upper Fairgrounds. If you enjoy singing, ask to join in singing a tag! We love to share the barbershop sound.