Unduvap Poya is the last Full Moon Poya day of the year and commemorates the arrival of Sangamitta Theri in Sri Lanka with a Bo sapling from the sacred Jaya Sri Maha Bodhi in India during the month of Unduwap.
Il Full Moon Poya Day is the last Poya in the rainy season. On Il Full Moon Poya Day was the receipt of permission (Niyatha Vivarana) by Bodhisatra Maitriya to be the next Enlightened One or the Future Buddha Maitriya. Siriwaddana had entered the Buddhist Order as Bhikku Maitriya. The Buddhas with his divine vision and insight predicted that in Benares there will be a kingdom known as “Kethumathi” and a king called Sanka whose advisor Subrahamme and his wife Brahamawathi will be parents of Future Buddha Maitriya and that he will attain enlightenment under Banyan Tree.
Binara Pasalosvaka Poya occupies a significant place in the history of Buddha Sasana. It is on this Poya day, Bhikkhuni Sasana was founded.
The Vinaya Pitaka and Anguttara Nikaya give the following account on setting up the monastic order for women thus: At one time the Buddha was in Kapilavatthu and his step-mother, Maha-Pajapati Gotami asked permission to go forth into the homeless life.
Nikini full moon day falling due one month after the commencement of “Wassana Kala“the rainy season: is of special significance for Buddhists due to a number of incidents that took place on this day.
Commemorating the lord Buddha's first sermon and the arrival of the Tooth Relic in Sri Lanka, the Esala Full Moon Poyaday is celebrated today by the Buddhists all around the world.
Poson is a festival celebrated in Sri Lanka on the full moon day in June. Poson Poya is noteworthy to Sri Lankan Buddhists as the day on which Emperor Asoka's son, Arahant Mahinda, introduced Buddhism to the island in the 3rd century B.C.