Concert for Diana and Live Earth concert, London
Concert for Diana (The People's Princess) was a concert held at the new Wembley Stadium in London in honour of the late Diana, Princess of Wales on July 1, 2007, which would have been her 46th birthday; 2007 is also the 10th anniversary of her death. The concert was hosted by Diana's sons, Prince William and Prince Harry who helped to organise for many of the world's most famous entertainers and singers to perform at the concert. The concert was broadcast in 140 different countries across the world. And one week later 
On July 7, 2007 the venue of the Wembley Stadium was one of the locations of the Live Earth-concerts: Live Earth concert, London
 Did they make use of each others facilities and know-how?
 Who did pay for the original preparations, technical equipment etc. The organisation of the Concert for Diana or the organisation of Live Earth or did they split the bill? 
 Which artists performed therefore only once or just twice? 
 How did staff and management perform?
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