Business Directory Go back to directory. Miles City Bluegrass Festival Miles City Bluegrass Festival Contact: Mike Grenz Work PO Box 913 Miles City Montana 59301 work Work Phone: 406-951-3101work Work Email: milescitybluegrassfestival@gmail.comINTERNET Website: Miles City Bluegrass Festival BiographyThe Miles City Bluegrass Festival is held at the Eastern Montana Fairgrounds, in the Home Show Building, the 3rd weekend of September each year. If you want to see entertainment at its best, make plans to attend now. There will be a food court open throughout the festival. Check out our page for more information. To purchase tickets, stop by the Miles City Area Chamber of Commerce at 511 Pleasant St. or call them at 406-234-2890.