The royal household's staffing levels have remained largely static at around 430 people, during the past seven years, to allow it to maintain the Queen's programme.
However this contrasted with the public sector which had seen employee numbers cut during the same period, and yet the sector was still expected to increase efficiency with fewer workers.
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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.
The victims were collecting permits and escorts a day after their home town was liberated from the extremists.
Scotland Yard said the male youths will appear in custody at Westminster Magistrates' Court on Saturday.