Always on the first Thursday in September. Even nowadays, in the morning, before the real business of the market begins, the sheep coming down from the mountains are still "divided", i.e. assigned to their owners. For many locals, homesick locals and visitors, however, the day really begins when the market and the music get going.
After an exciting train ride on the Bernina Line, or a hike or mountain bike ride, you'll love the view from the sunshine terrace of the Ristorante Alp Grüm at 2091 m.