Rani Sati Fair is celebrated twice a year, on Magh-Krishna Navami and Bhadrapada Amavasya (August). It is held at Jhunjhunu
. The fair takes its name from Rani Sati, the first of the series of thirteen Satis of the Jalan family, who immolated herself on Magh Krishna Navami day. The last Sati was performed on Bhadrapada Amavasya.
A legend is associated with this fair. Folklore is that Tandhan Ram, the son of the Nawab of Hissar, owned a fine mare. Fascinated by this mare, the son of Nawab of Hissar decided to own the mare. But Tandhan Ram refused to give the mare, and he killed the son of the Nawab of Hissar. The Nawab of Hissar then killed Tandhan Ram while he was returning with his wife Narainidevi to Jhunjhunu. Narainidevi took the body and immolated herself on the funeral pyre. Later she appeared as goddess and her followers are Jalans.