It is the greatest festival in Tibet. In ancient times when the peach tree was in blossom, it was considered as the starting of a new year. Since the systematization of the Tibetan calendar in 1027 A.D., The first day of the first month became fixed as the new year. On the new year's the families unite " auspicious dinner" is offered and the auspicious words " tashi delek" are greeted. It is the most colorful festival of Lhasa.