Lughnasadh, also known as Lammas Day, is a traditional Celtic festival that marks the beginning of the harvest season. It is celebrated on August 1st in the Northern Hemisphere and February 1st in the Southern Hemisphere.

The word "Lughnasadh" comes from Irish Gaelic, with "Lugh" referring to the god of light and "nasadh" meaning assembly or gathering. This festival was named after Lugh in honor of his victory over the ancient gods of Ireland.

During Lughnasadh, people  gather together to celebrate and give thanks for the bountiful harvest.