Answer : 1. "Magh Purnima"
Explanation :

1. The famous Beneshwar fair of Rajasthan is held in the month of Magh. Beneshwar Fair is a popular tribal fair held in Dungarpur district of Rajasthan state, India.

2. The fair is held in the month of February at Beneshwar, a small delta formed by the Soma River and 68.4 kilometers from Dungarpur.

3. Beneshwar Fair holds immense religious significance for the Bhils, a tribal community located in Rajasthan and neighboring states.

4. This tribe gathers here in large numbers, making the festival no less than the Kumbh Mela of the tribes.

5. The term Beneshwar is generally addressed to Lord Shiva and the Shiva Linga present in the Mahadev temple which is situated near the confluence of the Som, Mahi and Jakham rivers.