The fair of Mela-Jagra is celebrated to commemorate the birthday of Lord Mahasu, the deity popularly revered in the areas of Shimla
, Sirmaur and Jaunsar. It is celebrated on the fourth day of the fair.
The fair takes place in night, and the next day a man who is chosen by the deity sleeps in the temple and act as a caretaker. He observes fast the whole day and performs Puja.
A symbolic object from the temple is taken to water tank and is bathed. The people who accompany it are sprinkled with water from the ritual wash. Then, a community feast is organized with the items obtained from the houses in the village.
A huge bonfire named cheeda is lit in the evening, and it is considered the symbol of the celebration. The priest performs puja to it, and the people witness it with great respect.