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Parinirvana is a Mahayana Buddhist festival that marks the death of the Buddha. It is also known as Nirvana Day. Buddhists celebrate the death of the Buddha, because they believe that having attained Enlightenment he achieved freedom from physical existence and its sufferings. Find out more at: http://www.bbc.co.uk/religion/religions/buddhism/holydays/parinirvana.shtml