When the summer retreat for their intensive training is over, monks are served with yoghurt. That is said to be the origin of 'Zhoton', which is also called the 'Yoghurt Festival'. At Drepung Monastery there are 'Cham' dances and the grand thangka is unveiled early in the morning. After devoutly viewing the thangka, the people go onto the Norbulingka and other popular spots for a lingka (picnic). 'Shoton' is also known as the 'Tibetan Opera Festival' due to the competitive performances of Ache Lhamo (Tibetan Opera) that are held at the Norbulingka.

It is the opera festival and the greatest festivals in tibet.In ancient times pious folks went into mountain hermitages for penance, and on the last day of which Yoghort was served for meal followed by entertainment of folk songs and daces. Since 7th century, opera performances were held for days in Norbu Lingka. Presently, opera contests and distribution of prizes are held for seven days.