Kilminster joins from Park Inn Heathrow (Rezidor Hotel Group), where for the past two years she has worked as the conversion and strategies manager for MICE.
Her new role will include management of clients including BT and General Healthcare.
Kilminster said: "I am very excited about joining Venues Event Management. I am looking forward to joining a family feel team working together on delivering the best and most memorable events for our clients."
Mark Fry, director of operations and sales, Venues Event Management, added: "On behalf of Venues Event Management I would like to welcome Karen to the team. Karen already has detailed knowledge about the industry and I believe she will be a great asset to the company."