The festival is celebrated in the summer, from the 15th to the 24th of the 5th lunar month - usually about the middle of August, after a month's retreat by the monks who stay within their monasteries to avoid walking on the emerging summer insects and killing them.
It began in the 11th century with a banquet given by the laypeople for the monks featuring yogurt. Later on, summer operas, or Lhamo, and theatricals were added to the festivities.[4] The operas, "last all day with clashing cymbals, bells and drums; piercing recitatives punctuating more melodious choruses; hooded villains, leaping devils, swirling girls with long silk sleeves. In the past, dancers came from all over Tibet, but today there is only the state-run Lhasa Singing and Dancing Troupe."[5]