Sports fans are being given the chance to get back into the Olympic Park before it reopens to the public in July.
Tickets are being offered for tours of the site in Stratford, between March 29 and May 6, as it is redeveloped into the Queen Elizabeth Park.
The park has been closed since the 2012 Games ended last September.
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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.