The Madin Full Moon Poya is an important Buddhist holiday observed in Sri Lanka, typically during the month of March. The holiday is also known as the Māgha Pūjā, which translates to "Festival of the Fourfold Assembly."
The Madin Full Moon Poya commemorates a significant event in Buddhist history when over 1,250 arhats (enlightened disciples of the Buddha) spontaneously gathered to pay homage to the Buddha on the full moon day of the third lunar month, known as Magha. This event occurred nine months after the Buddha's enlightenment and is considered to be one of the most important events in Buddhist history.
On the day of the Madin Full Moon Poya, Buddhists in Sri Lanka gather at temples to offer prayers, listen to dharma talks, and engage in acts of merit such as making donations and performing acts of kindness. Many Buddhists also participate in processions, where they carry lanterns and other symbolic items.
Overall, the Madin Full Moon Poya is a day for Buddhists to reflect on the teachings of the Buddha and strive towards achieving enlightenment themselves. It is a day of great importance in Sri Lanka and is observed with reverence and respect.