Makha Bucha Day, 15th day of the waxing moon of the 3rd lunar month.
The meaning of the word “Makha Bucha” is an abbreviation of the word “Makhapuraṇami Puja” means worshiping the Buddha on the full moon day of the 3rd lunar month, which on this day itself exceeds 4 important events at the same time, called “Chaturangkhasannipat” with the following meanings.

Chatur means 4
Ong means part
League means meeting.

The miraculous events that occurred in 4 important events at the same time are as follows:
1. 1,250 monks traveled to see the Lord Buddha at Weluwan Mahavihar, Rajgir, Bihar. These monks dispersed to go on a mission to spread Buddhism in various places.
2. These 1,250 monks are all Arahants who were ordained directly by the Lord Buddha, called "Ehi Bhikkhu Upasampada".
3. 1,250 monks gathered together without an appointment.
4. Date of meeting Corresponds to the full moon day of the month of Magha. (Full moon day in the middle of the 3rd lunar month) is the day the Lord Buddha gave a sermon. Which is the heart of Buddhism is the Ovada Patimokkha.