[1] In Bhutan, it is celebrated on the fifteenth day of the fourth month of the Bhutanese calendar.

It celebrates the day when the Buddha is said to have achieved Parinirvana, or complete Nirvana, upon the death of his physical body.

Other observances include meditation and visits to Buddhist temples and monasteries.

This thought process reflects the Buddhist teachings on impermanence.

Some Western Buddhist groups also celebrate Parinirvana Day.