One Direction won at the Brit Awards on 21 February 2012. Harry had just turned 18, Liam and Niall were 18, Zayn was 19, and Louis was 20.
Three days after the Brits, they were in Chicago for a radio interview/meet and greet. They also opened for Big Time Rush that night, and proceeded to play 12 shows over the next two weeks, each in a different city. During March they also did at least six signings, some smaller performances (such as three songs on the Today Show), and over 60 interviews.
(14 March 2012)