Magha Puja is the second most important Buddhist festival. It occurs in the month of Magh in the lunar calendar, usually between mid-January and mid-February. This festival commemorates the spontaneous assembly of 1250 disciples of Buddha coming to see him and pay their respects. At this gathering, Buddha delivered a sermon where he asked them to do good, abstain from evil, and purify the mind.
Information on Magha Puja and here.
