Mark Fryer, of Allerdale council, said: "We're here to show off the best of what we have in Allerdale.
"We have brought together big businesses, food producers and organisations to show everybody how great we are."
As a central part of the Northern Powerhouse, Manchester is seen as a key area for the borough to promote itself, said council leader Alan Smith.
“We want people to see Allerdale is a fantastic place to live, train, work and develop your career and life," he added.
Chris Sutcliffe, of Iggesund Paperboard, said: "We are here to raise the profile of industry in Allerdale.
"People recognise our packaging, such as Chanel perfume or Toblerone chocolate, but they don't the company behind the packaging. We're also here to promote career opportunities."
Jan Weir, of Honister Slate Mine, said: "It's been really brave to put this event on and very admirable.
"The camaraderie has been lovely and it's been great to network with all of the Allerdale businesses. We're all here for the same thing, to tell Manchester how great Allerdale is."
Sue Clarke, sales and marketing manager of Cumbria Tourism, added: "We've had some really interesting conversations about the Lake District and it's surprising how many people have not been, considering how close it is. We've had some great feedback and people have been very surprised about what we have to offer."
Jo Martin, of BEC, said: "We're here to support Allerdale to sell one of the most beautiful parts of the UK to the people of Manchester."