The Olympic Stadium will host a dedicated day of Paralympic sport, as part of a three-day event one year on from the London 2012 opening ceremony.
The Paralympic competition will follow two days of Diamond League athletics to make up the London Anniversary Games from 26 to 28 July.
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A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.