Makha Bucha

Māgha Pūjā (also written as Makha Bucha Day, Meak Bochea) is a Buddhist festival celebrated on the full moon day of the third lunar month in Cambodia, Laos, Thailand, Sri Lanka and on the full moon day of Tabaung in Myanmar. It is the second most important Buddhist festival after Vesak; it celebrates a gathering that was held between the Buddha and 1,250 of his first disciples, which, according to tradition, preceded the custom of periodic recitation of discipline by monks. 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. In Thailand, the Pāli term Māgha-pūraṇamī is also used for the celebration, meaning 'to honor on the full moon of the third lunar month'. Finally, some authors referred to the day as the Buddhist All Saints Day.

Makha Bucha is observed in Buddhism. The summary above comes from Wikipedia, where you can read about the history and traditions of this observance.

Makha Bucha falls on Sunday, February 21, 2027. The countdown above updates live, so you always see exactly how many days, hours, and minutes are left.