sentences:  In 1973, the All Japan Marching Band and Baton Twirling Association held its first national event at the Tokyo Metropolitan Gymnasium, which had been built in 1954 for the World Wrestling Championship and was later used for gymnastic events at the 1964 Summer Olympics.The Aimachi Band appeared at this event, which at this time also used a non-competitive festival format.The Tokyo Metropolitan Gymnasium remained the site of this event until 1977, when it moved to the Nippon Budokan, where it remained for over 20 years.