The contract covers all live events for both Vauxhall and Chevrolet brands in the UK and will this month involve a business conference for around 400 of the automotive company's dealers, known as retail operators, at Wembley Stadium.
Deeper Blue was formed in 2009 by Jeremy Garbett and Laurence Croneen and has worked with brands including Samsung and Lexus Europe.
Over the past 12 months Deeper Blue has worked with Vauxhall on a consultative basis across projects including the launch of the new Astra.
Garbett said it had been a "hugely exciting" year for the agency.
Founding director Croneen added: "There are very few big brands out there that give a long contract nowadays, but this is for two years and covers all Vauxhall's live events. The retail operator conference is a very important event because it is a chance for Vauxhall to emphasise the priorities of the year ahead. The future is very exciting."