Pavāraṇādivasa is the last day of the rains-residence, or end of the rains-retreat, it can called the The End of Buddhist Lent Day too.
Usually refers to the end of the first Buddhist Lent. or the end of the purim, including the 15th day of the waxing moon of the 11th lunar month, which is the day the monks performed the sacrament called “Pavarana”, so called Pavarana Day or Maha Pavana Day (the day of Buddhist Lent after or the end of the last Buddhist Lent)
Pavāraṇādivasa is the end of Buddhist Lent for monks who have been together in a temple or place where they have prayed for a period of 3 months. Each monk is allowed to rebuke and admonish each other. About any behavior from the Thera, a senior monk, could be able to admonish or give an opportunity to ask questions about each other.
Doing Maha Pavarana is a kind of sacrament instead of chanting the Patimokkha (Vinaya or Discipline) which is normally done.
Buddhists like to make a special merit on this day, such as offering food to monks in the morning to dedicate merit to deceased relatives. Going to give a merit at temples, listening to sermons. and offering alms to Tak Bat Devo on the next day (1st day of the waning moon of the 11th lunar month).
There are benefits from performing the end of Buddhist Lent ceremony, for example, we remind ourselves that a Buddhist Lent has passed another year. In order not to live in negligence, to accelerate the creation of all merits In addition, the matter of the consecration It is for others to be able to guide us. In which we may not see what we doing wrong, it will turn to look at ourselves to improve and will not make the same mistake again. Therefore, it is considered the principle of living together happily.