sentences:  Apart from industry and tourism, various international regular trade fairs, such as "Aero" (aviation technology), "Interboot" (water sports), "OutDoor", "Motorradwelt" (Motorbikes), "Eurobike" (bicycles) and "Tuning World Bodensee" (car tuning) are important economical factors.There is a large fair ground (Messe Friedrichshafen) near Friedrichshafen airport where all these and many more trade fairs take place every year.Furthermore, the Graf-Zeppelin-Haus cultural centre has become a popular location for congresses, conferences, musical and other events.