Thursday is Peace One Day, and Yoko Ono and Elton John are among the artists who are participating in events in recognition of the annual celebration.

•Yoko's IMAGINE PEACE message will be translated into 24 world languages and displayed hourly in New York's Times Square.
•And in London, Elton will headline the Peace One Day concert at Wembley Arena. The concert, the last major event of the London 2012 Festival and Elton’s only London show this year, will stream live on YouTube.