Rituals associated with the structure probably coincided with Mahanavami.

Explanation:
Mahanavami is a significant Hindu festival that is celebrated on the ninth day of the Navaratri festival, which lasts for nine nights. It is observed to honor the goddess Durga and commemorate her victory over the buffalo demon Mahishasura. The festival is particularly celebrated in the Indian states of West Bengal, Bihar, Odisha, and Assam.

During Mahanavami, various rituals and traditions are followed. These rituals are associated with the structure, which refers to the place of worship or the temple where the goddess Durga is worshipped. The rituals may include:

1. Prayers and Offerings: Devotees offer prayers and perform rituals to seek the blessings of the goddess Durga. They offer flowers, fruits, sweets, and other items as a mark of respect and devotion.

2. Puja: Elaborate puja ceremonies are conducted in the temples dedicated to Durga. Priests perform rituals and chant sacred mantras to invoke the presence of the goddess.

3. Aarti: Aarti is a ritual where a lamp with multiple wicks is lit, and the flame is waved in a circular motion in front of the deity. It is accompanied by the chanting of hymns and the ringing of bells.

4. Cultural Programs: During Mahanavami, cultural programs and performances are organized to showcase the rich cultural heritage of the region. Dance, music, and drama performances are held, depicting mythological stories and legends associated with Durga.

5. Processions: In some regions, grand processions are taken out, wherein an idol of Durga is carried in a beautifully decorated chariot or palanquin. Devotees gather in large numbers to participate in the procession and seek the blessings of the goddess.

These rituals associated with the structure are performed to pay homage to the goddess Durga and seek her divine blessings during the auspicious occasion of Mahanavami.