Hello,
the next edition of "Inventa il Vento" our indoor day will be on sunday 31th january 2016 in Palayuri, Bologna, Italy.
Here some pics from the past editions:
http://blog.inventailvento.it/foto/
free flight, ballett, children workshop, music, food.. and a lot of fun !!
There are cheap Ryanair flights from Dusseldorf & Berlin 
Chers
Tullo