Hello Dan,
Yes, this is an anual show, and there has been one last saturday, check my new thread for pictures.
Why so many cranes, well this show is especially for heavy haulage, cranes and earth moving equipment.
My interest is with cranes, so lots of pictures from cranes.
Check out
http://www.modelshow-europe.com/ for information.
The site is updated every year for the new edition, but you have to wait for a year unfortunately.