Buddha Purnima is marked as the most important day, commomerating the three most significant events in the life of Gautama Buddha that occurred on the same day. His birth, enlightenment and death (nirvana), all happened in the month of Vaishak, on a full moon night in April/May.

Thus, this makes the day - called Buddha Purnima Festival or Buddha Jayanti Festival- all the more sacred for Buddhists.