Parinirvana Day is observed on February 15, 2016. Parinirvana Day, or Nirvana Day is a Mahayana Buddhist holiday celebrated in East Asia. By some it is celebrated on the 8th February, but by most on the 15th February. It celebrates the day when the Buddha is said to have achieved Parinirvana, or complete Nirvana, upon the death of his physical body. Buddhists celebrate the death of the Buddha because they believe that since he was Enlightened, he was free from the pain of physical existence.