Ministry of Justice figures show that up to 259,000 victims of burglary and up to 18,000 victims of robbery each year would not be routinely offered the help they want if these proposals go ahead, Victim Support said.
The charity said independent research also shows that 58% of victims need support regardless of the crime type.
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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.