Buddhists around the world mark the day with reverence as many significant events in Buddhist history took place on such a day.
It is on such a Full Moon Poya Day that Lord Buddha appointed Arahaths Sariputra and Moggalyanya as his chief disciples.
The first-ever Buddhist congregation was also held on a day such as today.
Incidentally, it is on a Navam Full Moon Poya Day that Lord Buddha preached the Ovadha Prathimoksha – which provides guildelines for am ordained Bhikkhu .
Another significant event which occurred on Navam Full Moon Poya Day is the announcement made by Lord Buddha that he would attain Parinibbana on Vesak Full Moon Poya Day .