The Beatles performed an iconic live concert at Shea Stadium in New York on August 15, 1965. This show is considered a milestone in popular music history as the first major stadium concert, with an attendance of 55,600 people. It was one of the Beatles' most famous early stadium performances, capturing the massive fan frenzy and setting the stage for future large-scale concerts.
Additionally, another iconic Beatles performance was their final live appearance on January 30, 1969, which was a rooftop concert on the roof of their Apple Corps headquarters at 3 Savile Row in London. This unannounced concert has also achieved iconic status as a historic moment in music, marking the end of their live performances.
To clarify, the most widely recognized iconic stadium performance of The Beatles is the Shea Stadium concert in 1965. The rooftop concert in 1969, while iconic and historic, was not in a stadium but on a rooftop.