Openair Frauenfeld 2015 is one of the biggest open-air festivals in Switzerland. This year's event will take place in Frauenfeld, Switzerland at the Grosse Allmend from July 9 to July 11. Every year over 100,000 people attend the event. Nicki Minaj is set to headline the festival on July 10, 2015. Her set is considered to be a part of her The Pinkprint Tour.