The central ring of the Hammerstein Ballroom holds several thousand people for events which can take place in a raised platform square with 4 parallel ropes attached with turnbuckle called what?
Hammerstein Ballroom:  The capacity of the ballroom is dependent on the configuration of the room; it seats 2,500 people for theatrical productions and musical performances, and several thousand for events held within a central ring. Boxing ring: A boxing ring is the space in which a boxing match occurs. Boxing ring:  A modern ring, which is set on a raised platform, is square with a post at each corner to which four parallel rows of ropes are attached with a turnbuckle.
A boxing ring