
Il Poya is the next to last poya of the rainy season and marks the conclusion of the first three-month retreat (Vassana-Samaya).
This Poya celebrates the obtaining of Vivarana (the assurance of becoming a Buddha) by the Bodhisatta Maitriya and the commissioning of 60 disciples by The Buddha to disperse his teachings.
According to tradition, the foundation stone for the Thuparamaya, Sri Lanka’s first stupa after the introduction of Buddhism was laid on this day many centuries ago.

Thuparama Sae Rajanan Wahanse: Twelfth of Sixteen Sacred Places in Sri Lanka
Thuparamaya, the oldest Stupa in Sri Lanka built after the introduction of Buddhism to Sri Lanka.