Buddha Purnima

The festival of Buddha Purnima is traditionally celebrated to commemorate the birth of Siddhartha Gautama​, who later became Gautama Buddha and went on to become the founder of Buddhism. On this day, people celebrate Siddhartha's choice to embrace a spiritual quest wherein he renounced all worldly pleasures to become a holy man. He chose this life when he witnessed the suffering of common people. He was hence inspired to let go of his royal life. 

Buddha's birth country is considered as Nepal, and there this day is celebrated in accordance to the full moon day of the Vaisakha month of the Buddhist calendar. Neighboring Southeast Asian countries too, celebrate this day during the Vaisakha month of the Buddhist and Hindu calendar, which is usually the month of April or May according to the Western Gregorian calendar.