Poson Poya, celebrated in Sri Lanka, marks the introduction of Buddhism to the island. Falling on the full moon day of June, it commemorates the arrival of Arahat Mahinda, who converted King Devanampiya Tissa to Buddhism in the 3rd century BCE. Devotees engage in religious activities, including visits to temples, meditation, and rituals to honor this pivotal event. Anuradhapura, the ancient capital, witnesses grand processions, illuminations, and cultural events during Poson. Pilgrims often partake in meritorious deeds and distribute alms. The festival holds profound significance, emphasizing Buddhism's enduring impact on Sri Lankan culture and spirituality.