The new business will be branded as Events By Appointment – The Ultimate Event Company.
The Appointment Group has offices in London, New York and Los Angeles and said the acquisition was part of a strategy to broaden its services in the UK and US for long-term business growth.
The Ultimate Event Company focuses on corporate event management and has been seeking an opportunity to join with a larger agency to expand its services.
Sue Martineau, managing director of The Ultimate Event Company, said the partnership with The Appointment Group's event division would allow it to better compete for global business.
"The combination of The Ultimate Event Company and the existing Events By Appointment team creates a substantial new force in the sector, with the resources to deliver full service events worldwide," she said.
Maurice Veronique, chief executive of The Appointment Group, said: "For several years, The Appointment Group has been looking for a highly professional and experienced management team to develop our events business.
"In Sue Martineau, Sam Robson [director of The Ultimate Event company] and their team, we feel that we have found the ideal partners to drive our events business forward."
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