Is the last day of the 3-month Rains Retreat which falls on the full-moon day of the 11th lunar month. After the end of such a retreat, the monks are allowed to travel elsewhere and stay at places outside their monasteries. But on the last day of the retreat there is an important function for the monks called pavarana, which gives special significance to the day.
At a pavarana ceremony, the attending monks invite one another to speak of any offences or unbecoming behaviour they have seen, heard or suspected to have been committed by anyone among them during the retreat.