Info from Wikipedia
Mayfair Ballroom was a ballroom and concert hall situated on Newgate Street in Newcastle upon Tyne, England. The oblong room was built to hold 1,500 people and had a small stage along one of the longer walls. It was opened in September 1961 by the Mecca organisation.

In 1999 the Mayfair was demolished and replaced with a retail and entertainment venue called The Gate. The closing night was attended by 5,000 people.