The company will be deploying around 4,000 members of staff to provide security and stewarding services at open air parks, race courses and concert halls across the country.
G4S acquired rival security firm Rocksteady last year and has since doubled its events business in size.
"We are really excited about the breadth of events we are supporting this summer," said managing director Mark Hamilton. "We were protecting politicians in April at the G20, and will be securing some of the world's biggest tennis players in June and arguably the world's biggest music stars in July - and that is just a small part of our schedule."
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