Annual Buddhist Celebration

Wesak or Vesak, also known as Buddha
Day, celebrates the Buddha’s birthday, enlightenment and death. It is
the most important day in the Buddhist calendar. In Japanese Buddhism,
8th April marks the birth of the Buddha, 8th December his enlightenment
and 15th February his death.

During
Wesak, Buddhists celebrate the life of the Buddha and his teachings.
They remember the night of his enlightenment and his insights into his
previous lives, as well as his revelations about the nature of death,
karma and rebirth, suffering and desire.

http://www.bbc.co.uk/schools/religion/buddhism/buddha_day.shtml