BJP chief Amit Shah will hold meets with workers across the state from September 30.
Bihar BJP spokesperson Sanjay Mayukh said Modi will address a big rally in Banka which goes to polls in the first phase on October 12.
BJP had lost from Banka in Lok Sabha polls last year and it believes that a Modi rally can help it regain ground there.
To rally party workers around, Shah, along with Bihar election in-charge Ananth Kumar, will hold nine meetings with them between September 30 and October 5 and also address three public meetings, Mayukh said.