[3] Poson is celebrated throughout the island, with the most important ceremonies of the festival being held in Anuradhapura and Mihintale.

[4][5][3] Poson is celebrated to commemorate the introduction of Buddhism to Sri Lanka by Mahinda Thero in 236 BC.

Celebrations are also centered around Buddhist sites in Anuradhapura, which was one of the first cities in Sri Lanka to convert to Buddhism.

Many of the most devoted pilgrims spend hours in quiet contemplation to honor the traditions of Buddhism.

[3] Some parts of Sri Lanka prohibit the selling of meat and alcohol during the festival.