The agency will be merged with the group’s Events By Appointment division, and rebranded as Events By Appointment – The Ultimate Event Company.
The deal is part of The Appointment Group’s strategy to grow business by offering a broader range of services in the UK and US.
The travel and event management company has offices in London, New York, and Los Angeles.
The Ultimate Event Company managing director Sue Martineau said: "As part of The Appointment Group we will be better able to compete for new business with global, multi-service organisations. We feel it offers us opportunities to extend our portfolio and offer a broader range of products and services."
The move will not lead to redundancies, she told C&IT, adding: "The merged team will actively offer events services to other clients within the other divisions of The Appointment Group, as well as a wider range of services to existing clients of The Ultimate Event Company, for which additional staff requirements are anticipated in the medium term."