It is the time of the year when new robes and other requisites may be offered by the laity to the monks.
Anapanasati Day At the end of one rains retreat (vassa), the Buddha was so pleased with the progress of the assembled monks that he encouraged them to extend their retreat for yet another month.
Many of these days celebrate the birthdays of Bodhisattvas in the Mahayana tradition or other significant dates in the Buddhist calendar. Typically on a festival day, lay people will go the the local temple or monastery and offer food to the monks and take the Five Precepts and listen to a Dharma talk.
The most significant celebration happens every May on the night of the full moon, when Buddhist all over the world celebrate the birth, enlightenment and death of the Buddha over 2,500 years ago. In the afternoon, they distribute food to the poor to make merit and in the evening join perhaps in a ceremony of circumambulation a stupa three time as a sign of respect to the Buddha, Dhamma, Sangha.
They assembled in the Veruvana Monastery with the two chief disciples of the Buddha, Ven. ("Dhamma Day") Asalha Puja means to pay homage to the Buddha on the full moon day of the 8th lunar month (approximately July).
It commemorates the Buddha's first teaching: the turning of the wheel of the Dhamma (Dhammacakkappavattana Sutta) to the five ascetics at the Deer Park (Sarnath) near Benares city, India.
People go to the beach or river bank with jars or buckets of water and splash each other.
When everyone is happily wet they are usually entertained by boat races on the river.
After the first Rains Retreat (Vassa) at the Deer Park at Sarnath, the Buddha went to Rajagaha city where 1250 Arahats,(Enlightened saints) who were the Buddha's disciples, without prior appointment, returned from their wanderings to pay respect to the Buddha. The assembly is called the Fourfold Assembly because it consisted of four factors: (1) All 1250 were Arahats; (2) All of them were ordained by the Buddha himself; (3) They assembled by themselves without any prior call; (4) It was the full moon day of Magha month (March).
It is held on the full moon of the seventh month of the Burmese lunar year starting in April which corresponds to the full moon day in October.