The annual event has been held at the Crowne Plaza Heythrop Park for the past three years but the 2014 conference will see a change of location.
GCA interim chief executive Iain Wylie said: "We wanted to announce the date of our next conference as soon as possible so people can make sure they get it in their diaries.
"We’re really excited to have found a new venue too and thought it would be more fun to get people to guess where it is rather than reveal the location straight away.
"During the next few months we will be releasing clues about the venue and asking people to submit their guesses. The first 12 people to get it right will receive a bottle of champagne in their room at the conference."