Friedrichshafen Ham Radio (yes, the name is not particularly creative) is the largest amateur radio convention in Europe and the second-largest in the world, marginally surpassed by the Dayton Hamfest as far as attendance goes. In 2014 it attracted about 17.000 people and even if the figures aren't out for this year yet, to the regulars it looked to be a just bit smaller. This year's (2015) edition of the Friedrichshafen Ham Radio was the 40th and was held from 26th to the 28th of June in the same place it has always been, the Messe (expo area) of Friedrichshafen, a small university city in the south of Germany, right on the North coast of Lake Constance (Bodensee).
Friedrichshafen is the home for some of Germany's iconic aviation / automotive companies, Zeppelin, Maybach, ZF (second largest automotive parts concern worldwide) and Dornier (manufacturer of bomber and fighter planes in WW II, now defunct) being based here. And thanks to the absolutely scenic geographical placement (you can easily see the majestic Alps in Switzerland and Lichtenstein on the other side of the lake), Friedrichshafen served as a resort for the german Nazi.