May 17, 1939: Both NBC and Mutual carried the event of a memorable dual-network radio broadcast of Glenn Miller and his Orchestra. The scene of the event was the Glen Island Casino in New Rochelle, NY. It was attended by 1,800 people and took place at the casino ballroom. This event, which lasted until August 18th of the same year, was a part of the orchestra's three-month summer season engagement at that casino. The recordings was broadcast by both NBC and Mutual which greatly helped make the Glenn Miller Orchestra become even more popular.with record-breaking attendance.