The Nabakalebara festival is a significant religious festival celebrated in the eastern state of Odisha, India. The word "Nabakalebara" is a combination of two Odia words - "naba," which means new, and "kalebara," which refers to the body. The festival marks the changing of the bodies of Lord Jagannath, Lord Balabhadra, and Devi Subhadra, the deities of the Jagannath Temple in Puri, Odisha.

The festival is celebrated once every 12 to 19 years when the Hindu lunar calendar adds an extra month, known as Adhika Ashadha. The exact date for the festival is determined by the priests of the Jagannath Temple, who consult with astrologers and determine the most auspicious day for the event.

During the festival, the idols of Lord Jagannath, Lord Balabhadra, and Devi Subhadra are replaced with new ones made of neem wood. The ritual involves several elaborate ceremonies, including the carving of the new idols, the transfer of the Brahma (life force) from the old to the new idols, and the final procession of the new idols to the Jagannath Temple.

The Nabakalebara festival is a significant event in the state of Odisha and is celebrated with great fervor and enthusiasm. Millions of people from all over India and the world come to Puri to witness the event and take part in the festivities. The festival is marked by colorful processions, music, dance, and elaborate feasts.

In conclusion, the Nabakalebara festival is a unique and significant event that belongs to the eastern state of Odisha in India. The festival is celebrated with great zeal and devotion and is a testament to the rich cultural heritage of the state.