Lughnasadh was the Celtic festival traditionally marking the beginning of the grain harvest.
Observed around 1 August, Lughnasadh was one of the four major seasonal festivals of Gaelic Ireland and Scotland, alongside Samhain, Imbolc, and Beltane. The name refers to Lugh, a prominent figure in Irish mythology, and is often connected with a ceremonial gathering established in honor of Tailtiu.
Historical celebrations included assemblies, athletic contests, trading, feasting, matchmaking, and visits to sacred places. The first grain and other produce could be incorporated into ritual meals and offerings.
Lughnasadh is sometimes confused with Lammas, the Christian harvest observance traditionally kept on 1 August. Their dates and harvest associations overlap, but they come from different religious traditions.