The Butter Lamp Festival is a traditional Tibet festival, also known as Butter Lantern Festival. Tibetans call it "Chotrul Duchen". It falls on the 15th of the first month in Tibetan Calendar, a full moon day, and closely follows Losar - the Tibetan New Year.
The Butter Lamp Festival was held by Tsongkhapa for the purpose of celebrating the victory of Sakyamuni Buddha over his opponents in a religious debate. Each year, Tibetan Buddhist monasteries shall hold an exhibition of butter sculptures and light the butter lamp for a blessing. The most famous exhibitions are at the Jokhang Temple in Lhasa Tibet, Kumbum Monastery in Qinghai, and Labrang Monastery in Gansu.