What happens to Micheal Jackson's concert tickets in London?

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Am wondering, with the death of Michael Jackson a lot of people around the world especially a majority from the UK will feel pained not only because a great idol, king of Pop, has passed but also a result of the financial burden his death has placed on some other people. So am wondering if a few of these people get to protest and ask for a refund what will happen? will the organizers be willing to pay? would it be fair to ask for a refund since the concert will no longer hold?