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The Ed Sullivan Show was a entertainment show which featured a series of three performances by Elvis Presley broadcast in September and October 1956 and January 1957. The Doctor and Rose Tyler attempted to travel to New York to attend the 28 October 1956 performance by Presley, but ended up instead in 1953 London. (DW: The Idiot's Lantern)
Sources
Elvis Presley on Ed Sullivan - http://www.edsullivan.com/artists/elvis-presley