Saga Dawa is a very important month in the Tibetan Buddhist calendar. This year, Saga Dawa, the fourth month of the Tibetan lunar calendar, started on May 7th and runs until June 5th 2016.
The 15th day of the lunar month, the full moon day, is called Saga Dawa Düchen. Düchen means “great occasion” and this day is the single most holy day of the year for Buddhists. This year Saga Dawa Düchen falls on May 21 2016. In other Buddhist traditions it is known as Vesak or is sometimes as Buddha Day. Saga Dawa Düchen commemorates the birth, enlightenment, and death (parinirvana) of Buddha Shakyamuni.
Since 1999, the United Nations has marked this sacred Buddhist day each year with a special message from the UN Secretary General. The UN Vesak page states, “Vesak, the Day of the Full Moon in the month of May, is the most sacred day to millions of Buddhists around the world. It was on the Day of Vesak two and a half millennia ago, in the year 623 B.C., that the Buddha was born. It was also on the Day of Vesak that the Buddha attained enlightenment, and it was on the Day of Vesak that the Buddha in his eightieth year passed away.”