Māgha Pūjā (also written as Makha Bucha Day) is the second most important Buddhist festival after Vesak, celebrated on the full moon day of the third lunar month.
Why is it important?
Magha Puja marks an event early in the Buddha's teaching life when a group of 1,250 enlightened saints ordained by the Buddha gathered to pay their respect to him. It is celebrated on various dates in different countries.
On the day, Buddhists celebrate the creation of an ideal and exemplary community, which is why it is sometimes called Saṅgha Day, the Saṅgha referring to the Buddhist community, and for some Buddhist schools this is specifically the monastic community.