On this day-long ago in India, 1,250 of Buddha’s followers came to see him on their own initiative without a scheduled meeting. All of these followers were said to be “enlightened ones” whom Buddha himself then ordained as teachers. He gave them the main, core teachings of Buddhism to pass on. These teachings were: cease from evil, do good, and cleanse your mind.
Over 40 years later, on this same day, it is said that Buddha made the decision to reach “Nirvana,” which means the mind departing from the body and the body dying. It was three months later, on Visakha Bucha Day, when this happened.
In Thailand, people go to Buddhist temples on Makha Bucha Day to take part in rites and to “earn merit.” They may also abstain from alcoholic beverages, give food offerings to monks, meditate, and take part in a late-night candle procession.
Information from : Public Holidays Global