The festival that involves giving thanks for the seasonal harvest in Celtic cultures is known as Samhain or the Autumn Equinox. This celebration, which takes place around October 31st, marks the end of the harvest season and the beginning of winter. It is a time for communities to come together to share gratitude for the crops collected and to honor the ancestors. Rituals may involve lighting bonfires, feasting on harvest foods, and storytelling. Samhain emphasizes the cyclical nature of life and the importance of community in acknowledging both the bounty of the earth and the passage into the darker months ahead.