Ill Full Moon Poya is a public holiday in Sri Lanka. It usually falls in November in the western calendar. It is the penultimate Poya of the year and marks the end of the rainy season and the conclusion of the 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.