The Manhattan Center is a building in NY with two venues on different floors -- The Grand Ballroom and the Hammerstein Ballroom.
Yet, we are listing Grand Ballroom, Hammerstein, and Manhattan Center as separate venues.
All references to Manhatan Center should be modified to reflect the proper site -- technically it would be "Grand Ballroom at Manhattan Center" but Grand Ballroom, New York, NY should be good enough. A few entries for Manhattan center are locked.