Lughnasa or Lughnasadh is a Gaelic festival marking the beginning of the harvest season. Historically, it was widely observed throughout Ireland, Scotland, and the Isle of Man. In Modern Irish it is called Lúnasa, in Scottish Gaelic: Lùnastal, and in Manx: Luanistyn. Traditionally it is celebrated on August 1, or about halfway between the summer solstice and autumn equinox. Lughnasa is one of the four Gaelic seasonal festivals, along with Samhain, Imbolc, and Beltane. It corresponds to other European harvest festivals such as the Welsh Gŵyl Awst and the English Lammas.
Lughnasadh is mentioned in some of the earliest Irish literature and has pagan origins. The festival itself is named after the god Lugh. It involved great gatherings that included religious ceremonies, ritual athletic contests, feasting, matchmaking, and trading. One of the most prominent gods in Irish mythology, Lugh is portrayed as a warrior, a king, a master craftsman and a savior. He is associated with skill and mastery in multiple disciplines, including the arts. He is also associated with oaths, truth, and the law.