Chotrul Duchen -  (meaning "great day of miraculous manifestations" is often known as "the butter lamp festival "). It is one of four Tibetan Buddhist festival commemorating four events in the life of Buddha. To commemorate the occasion, Tibetans make yak butter lamps, in the shapes of flowers, trees, birds, and other auspicious symbols. They also create elaborate displays for the lamps in their homes and in public spaces.

All the lanterns are lit in celebration on the fifteenth day of the month. 

It closely follows the TIbetan New year and takes place on the 15th day of the first month of the New Year during the full moon. The first fifteen days of the year celebrate the fifteen days during which the Buddha performed miracles for his disciples to increase their devotion. During this time, it is believed that the effects of both positive and negative actions are multiplied ten million times.