With approximately 50.000 visitors every day, the Openair Frauenfeld is the biggest openair of German-speaking Switzerland and the biggest urbane /Hip Hop festival of Europe.
Since 1985, the event takes place in mid-July. The location is the big Allmend in Frauenfeld with an area of 50 hectare.
http://www.openair-frauenfeld.ch/en/