Barack Obama at a public appearance for a campaign rally in Philadelphia, PA, October 11, 2008. Photo by: Kristin Callahan/Everett Collection *Former U.S. President Barack Obama is set to command a ...

Former US President Barack Obama will appear at London's O2 Arena on 24 September for a one-night-only speaking engagement. While the event is billed as 'an evening of conversation and inspiration', ...