Yes, this type of work does exist. Would be best to attend these tradeshows and network. Look at which hotels are associated/sponsor the trade shows and stay there. The bars in these hotels are a great place to network.
At one time this was my work, trade show set-up...sponsors as well as attendees. Most of my work was in Africa. Biggest show are Marrakech and Pretoria but Europe has many...Berlin, Friedrichshafen etc. internet search...police shows too