The conference will be attended by internal delegates from the mobile network as well as a selection of manufacturers. This large-scale event will be followed by a series of off-site events for a variety of departments within the company. The negotiation process for the conference is ongoing.
Ben Gallop, co-founder, Brand & Deliver, said: "Our approach is for consistency of message and belief in the brand and we want to make sure that the message is consistent across the business.
"Three are being very proactive and they want to make a name for themselves in what has become quite a stagnant industry. Our goal is to make people love the network."
Rebecca Griffith, retail marketing, Three, added: "Throughout the pitch process with Brand & Deliver we got a really good feeling about them.
"They are like-minded in the way they work, creative and agile in their ability to get things done, which is a key in delivering events with a wow factor and within budget. We are all very excited about working with them."
Brand & Deliver, who pitched against two other event agencies, will provide content and production services for Hutchison 3G UK following the restructure to the mobile network's events strategy.
The agency will begin working with Three later this month.