Sir Denis O'Connor, outgoing HM Chief Inspector of Constabulary, will give evidence on Olympics security.
Stephen Greenhalgh, Deputy Mayor of London for Policing and Crime, will give evidence on policing in London.
Metropolitan Police Commissioner Bernard Hogan-Howe has also been asked to give oral evidence.
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David Cameron, Ed Miliband and Nick Clegg urged people to vote for them as the campaign trail draws to an end.
Roger Daltrey has confirmed his band will and promised to close the festival "with a bang".
On Thursday the Scottish people are expected to signal Labour’s demise north of the border and herald in an army of SNP MPs.