Informally known as "Buddha's Birthday", Vesak Day is considered the most holy day celebrated traditionally by Buddhists. It commemorates the birth, the Nirvana (enlightenment) and the Parinirvana (death) of Gautama Buddha. Usually Vesak Day falls on the month of May, on the 15th day of the fourth month of the Chinese Lunar Calendar.
Vesak Day is a season of gratitude. Buddhists believe that doing good deeds on Vesak Day will proliferate merit and it is often a day when Buddhists carry out acts of generosity that can include freeing of caged birds and animals, giving goods to the deprived and needy, and giving gifts to charity. These acts of generosity are also known as Dana.