Wan wisakha pucha is celebrated on the full moon of the sixth month of the lunar year (usually mid-May). This may be the most important monastic and public Buddhist ceremony in Thai calendar. It celebrates three great events in the Buddha's life: the day the Buddha was born, attained enlightenment, and passed away. Wan wisakha Pucha is usually celebrated with a sermon, often drawn from the Mahaparinibbana Sutta , and then a great candle procession three times around the main chedi of each monastery