The head of the Derbyshire Police Authority and Chief Constable Mick Creedon will both attend the event.
Humberside police and crime commissioner (PCC) Matthew Grove has put forward the Tayside chief constable Justine Curran as the force's new head.
BBC: Humberside PCC backs Justine Curran for chief constable
Mr Crompton emailed the force's Assistant Chief Constable Andy Holt and head of media Mark Thompson on 8 September, four days before the Hillsborough Independent Panel Report was released.
The move follows Michael Fuller, the first black chief constable in the UK, officially starting his new job as the head of Kent Police on 1 January.
He also served as the head of counter-terrorism within Scotland Yard and joined the Devon and Cornwall force as Deputy Chief Constable in April 2010.
BBC: Shaun Sawyer confirmed as Devon and Cornwall police chief
Constable Carroll, 48, was shot in the head in Craigavon after answering a 999 call.
Deputy Chief Constable Mark Whyman, head of collaboration for policing Yorkshire and the Humber, said he could not rule out a complete merger of the four forces in the future but said there were no current plans to do so.
The High Court in Edinburgh heard that during the row at the house in Brown Constable Pend, Michael Gallacher suffered 10 knife wounds to his head, neck and chest.
Assistant Chief Constable Malcolm Graham, head of major crime and public protection, said the new approach aimed to identify victims of human trafficking rather than criminalising them.
Mr Weavers, a former head of CID and acting assistant chief constable who served in Essex 1969-2000, carried out the assault at 20:15 BST on Saturday, 11 August, the court heard.
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