Why is Onam celebrated? Know the Thiruvonam 2026 date, story of King Mahabali, traditional rituals and the festival’s deeper spiritual meaning. Onam 2026 will be marked by pookalam decorations, traditional Sadya, cultural events, and reunions within the family in the state of Kerala. The main ritual of the Onam celebrations, Thiruvonam, takes place on Wednesday, August 26, 2026. Onam is not just a harvest festival; it has a mythological significance of the returning of Mahaba