Activities begin early in the morning. People clean their house, take early bath, wear new clothes and participate in special prayers organised in individual homes and then in local temples. Later a very special and the biggest of all days Pookalam is prepared to welcome Maveli. Clay mounds in the shape of pyramids representing Lord Vishnu and Mahabali are prepared and placed in front of the Pookalam.
In the noon the grand feast of Onam called Onasadya is prepared. The strictly vegetarian meal consists of 11 - 13 mandatory dishes and is served on a banana leaf. The eldest member of the family presents gifts and new clothes to the family members.
Various cultural events are organised all over the state to mark the day. Dances, games, shows and get together are the other highlights of the day. Patassu (fire crackers) are also burnt to celebrate the occasion.
There are some rituals also marked for the eleventh and twelfth day called Avittom and Chatayam or Chathayam respectively. But the major celebrations get over on the tenth and the most important day of Thiruvonam.