Parinirva — Nirvana Day — is observed primarily by Mahayana Buddhists most commonly on February 15th. The word Nirvana means "to extinguish," such as extinguishing the flame of a candle.
The Historical Buddha died at the age of 80 in the company of his monks. As recorded in the Parinibbana Sutta, the Buddha knew his life was at an end and he assured his monks that he had withheld no spiritual teachings from them. He urged them to maintain the teachings so that they would continue to help people for the years to come.
With his last thoughts before he died, he said, "All conditioned things are subject to decay. Strive for your liberation with diligence."
Members on this day keep the Buddha's spirit in their mind and hearts and are encouraged to spread his teachings.