The west London agency has won a project to deliver an event for healthfood retailer Holland & Barrett.
A total of 450 store managers and senior executives will attend the conference in Birmingham on 8 October.
Meanwhile, around 1,000 delegates will attend technology analysis company Canalys' event in Spain on 8-10 October.
The Canalys Channels Forum - being held at the Hotel Arts and Hotel Pullman in Barcelona - is aimed at EMEA retailers and distributors.
According to MCM's events and communications director Debra Nightingale, working in partnership with clients will be a driver for growth in the coming year.
"Flexibility and understanding your clients' perspective is going to be key to continued success," said Nightingale. "It is about being innovative. Events are more considered and the value has to be justified as much as possible."
MCM has also been appointed by pharmaceutical company Boehringer Ingelheim to deliver a three-day sales conference for around 400 delegates in January.
In addition, the agency's ambitions to develop strategic communications partnerships with clients has led to the launch of a new experiential division last month (September), headed by account director Elaine Moss.
It has also won new communications projects with Ferrero - which owns brands including Ferrero Rocher and Tic Tac - and Sainsbury's.