Boris Johnson said the Conservatives have "to recognise that the sheer global charisma of London is putting pressure on Londoners."
Addressing delegates at the Conservative Party conference, the London Mayor highlighted that average house prices are now six times average earnings in the capital.
"The pressure is really growing and it's intensifying," he added.
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The band announced at a free concert on Friday that they would take over the event's Pyramid stage on Saturday June 25.
Sixty people died when a pick-up truck was blown up as they waited to collect permits and escorts a day after their home town was liberated.
Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.