Venues being used during the four-day conference include the Queen Elizabeth II Conference Centre in Westminster, the revamped Savoy Hotel, the Charing Cross Hotel and the Strand Palace Hotel.
Delegates will also take part in activities including visits to London landmarks and museums.
EMC3 has also been working with EA Games, which assigned planning its Christmas party for 280 people to the agency.
Managing director Baba -Jallah Epega has plans to expand the EMC3 team from six to eight in response to the increased workload, and said turnover was forecast to rise 17% to around £2m in 2011.
The agency is set to file its next set of annual accounts at Companies House on 31 March 2011 but is exempt from recording full figures under the Companies Act 2006.