1. There were 1,250 Sangha followers, which came to see the Buddha that evening without any schedule.
2. All of them were "Arhantas', the Enlightened o­ne and all of them were ordained by the Buddha himself.
3. The Buddha gave those Arhantas the principles of the Buddhism, called "The Ovadhapatimokha". Those principles are: - To cease from all evil, - To do what is good, - To cleanse o­ne's mind;
4. It was the full moon day.

Another important event, which happened o­n the same days (the full moon day of the 3rd lunar month) 44 years later, the last year of the Buddha's life, he decided to 'Parinibbhana', nirvana, leave the mind from the body or die. 3 months after that day (on the full moon day of the six lunar month -- we known as 'Visakha Bucha Day').

Activites to be observed o­n Ma Kha Bucha Day

'Tum Boon': Making merit by going to temples for special observances, making merit, listening to Dhamma preaching, giving some donations and join in the other Buddhist activities.

'Rub Sil': Keeping the Five Precepts, including abstinence from alcoholic drinks and all kinds of immoral acts.

'Tuk Bard': Offering food to the monks and novices (in the alm bowl).
Practice of renuciation: Observe the Eight Precepts, practice of meditation and mental discipline, stay in the temple, wearing white robes, for a number of days.

'Vien Tien': Attending the Candle Light Procession around the Uposatha Hall, in the evening of the Vesak full moon day.