Buddha Purnima is one of the main festivals during the Vaishak month, which marks the birth anniversary of Siddhartha Gautama, who later came to be known as Lord Budhha.Buddha Purnima, also known as Buddha Jayanti, is an auspicious day that marks the birth anniversary of Gautam Buddha, the founder of Buddhism. It is believed that this was also the day he attained enlightenment. Buddha Purnima falls on a full moon night, usually between April and May, and it is a gazetted holiday in India. This year it will be observed on Wednesday, May 26.