It is an ancient ritual associated with Jagannath Temple, Puri, Odisha, India (60kms from the city of #Bhubaneswar)when the Idols of LordJagannath, Balabhadra, Subhadra and Sudarshan are replaced by a new set of Idols.
A year which has two months (Adhika masa) of Ashadha as per the Hindu Calender is auspicious for conducting the ceremony. This usually occurs every twelve to nineteen years. The Deities are made from a special type ofNeem wood known as Daru Bramha.
Preparations for the ceremony start in the month of Chaitra.
Locating the four holy trees requires divine intervention.
As per long standing tradition the Priests of the Jagannath Temple (Puri) worship Maa Mangala at the Kakatpur Mangala Temple. It is said the Goddess appears to them in their dreams revealing the location of the holy trees.
Source: Article in Medium.com by Devasis Sarangi