Vesākha or Bon Visak Bochea day, in Khmer language, falls on the 15th day of the waxing moon in the 6th lunar month, which is usually May in the Gregorian calendar. On Vesākha day, devout Buddhists and followers alike are expected and requested to assemble in their various temples before dawn for the ceremonial, and honorable, hoisting of the Buddhist flag and the singing of hymns in praise of the holy triple gem: The Buddha, The Dharma (his teachings), and The Sangha (his disciples).
Devotees may bring simple offerings of flowers, candles and joss-sticks to lay at the feet of their teacher. These symbolic offerings are to remind followers that just as the beautiful flowers would wither away after a short while and the candles and joss-sticks would soon burn out, so too is life subject to decay and destruction.
Devotees are enjoined to make a special effort to refrain from killing of any kind. They are encouraged to partake of vegetarian food for the day. During the celebration of Vesākha, all liquor shops and slaughter houses are closed by government decree. Also birds, insects and animals are released by the thousands in what is known as a 'symbolic act of liberation'; of giving freedom to those who are in captivity, imprisoned, or tortured against their will.
Some devout Buddhists will wear a simple white dress and spend the whole day in temples with renewed determination to observe the eight Precepts. Devout Buddhists undertake to lead a noble life according to the teaching by making daily affirmations to observe the Five Precepts. However, on special days, notably new moon and full moon days, they observe the eight Precepts to train themselves to practice morality, simplicity and humility.
Some temples also display a small statue of the Buddha in front of the altar in a small basin filled with water and decorated with flowers, allowing devotees to pour water over the statue; it is symbolic of the cleansing of a practitioner's bad karma, and to reenact the events following the Buddha's birth, when devas and spirits made heavenly offerings to him.
Devotees are expected to listen to talks given by monks. On this day monks will recite verses uttered by the Buddha twenty-five centuries ago, to invoke peace and happiness for the government and the people. Buddhists are reminded to live in harmony with people of other faiths and to respect the beliefs of other people as the Buddha taught.