On Vesākha Day, Buddhists all over the world commemorate events of significance to Buddhists of all traditions: The birth, enlightenment and the passing away of Gautama Buddha. As Buddhism spread from India it was assimilated into many foreign cultures, and consequently Vesākha is celebrated in many different ways all over the world. In India, Vaishakh Purnima day is also known as Buddha Jayanti day and has been traditionally accepted as Buddha's birth day.
In 1999, the United Nations resolved to internationally observe the day of Vesak at its headquarters and offices.[8]
The name of the observance is derived from the Pali term vesākha or Sanskrit vaiśākha, which is the name of the lunar month in the Hindu calendar falling in April–May (see Vaisakha).[9] In Mahayana Buddhist traditions, the holiday is known by its Sanskrit name (Vaiśākha) and derived variants of it. Local renditions of the name vary by language, including: