The patron saint of Chiavenna is Saint Lawrence, celebrated on 10 August in the Collegiata di San Lorenzo.
Since 1956 Chiavenna has hosted the famous Sagra dei Crotti, during the second weekend of September: the feast's success is enormous, drawing people from Italy and abroad every year. The first weekend of October instead brings the Dì de la Brisaola. The town also holds Palazzo Salis and the Church of San Bartolomeo.