Echigo-Tsumari Art Triennial The Echigo-Tsumari Art Triennial, the world's largest art festival, takes place every three years in the Echigo-Tsumari region. The fourth event will be held in the 2009 summer. More than 150 artists from 26 countries will participate and create site-specific works throughout the large Satoyama setting. Over 300 works of art will be exhibited and various events will be held during the triennial period. Fascinating and entertaining artworks created for previous triennials, by more than 150 artists from across the world, remain in place throughout the area's 760 square kilometers