The Viljandi Folk Music Festival is a music festival in Estonia with a central focus on European folk music. It is traditionally held during the last weekend of July, when the otherwise quiet city of Viljandi is completely transformed as the small city center is suddenly flooded with people. The main attraction of the festival is the friendly atmosphere. Over 25,000 people attend the concerts every year, but many more just come to take part in the festivities. As such, it is the largest annual music festival in Estonia, and one of the largest folk music festivals in Europe.