The Erode East constituency seat in Tamil Nadu, Lumla in Arunachal Pradesh and Sagardighi in West Bengal was vacated after the demise of Thirumahan Everaa, Jambey Tashi, Subrata Saha, respectively.
The by-poll to the Sagardighi assembly seat was necessitated by the death of its three-time TMC MLA and state minister Subrata Saha in December last year.