This festival revolves around the display of a black jewel decorated vest (Bhoto) said to have been owned by Rato Machhindranath, the Hindu deity who is worshipped as the god of good harvest and rainfall.
The display of the vest takes place at the end of the month-long chariot pulling festival of Rato Machindranath Jatra, marking the start of the rainy season.
The legendary vest will be exhibited at Jawalakhel of Lalitpur each year during the festival.