Read the paragraph, then answer the questions

One of the festivals in the Buddhist tradition is called Vesak. It takes place in April or May, and it lasts for three days. The festival celebrates the life of Buddha, and it also marks the beginning of the Buddhist year. During the festival, Buddhists decorate their houses and streets with flowers and paper lanterns. They give presents to monks and to poor people, and they send each other cards. In India, they sometimes buy birds in cages and set them free.

What is Vesak?