BJP general secretary and in-charge of Bihar Dharmendra Pradhan said the rally would be Modi's first political engagement in Bihar and would be 'historic and crucial' for the 2014 Lok Sabha elections.
"Bihar heralded political change in the country in 1974 through JP movement, the Hoonkar rally will be crucial in the 2014 polls," Pradhan said.
Senior BJP leader Sushil Kumar Modi flagged off a mobile tea stall named 'NaMo tea stall' to highlight the Gujarat chief minister's childhood as a tea seller in trains.
Top BJP leaders, including Shahnawaz Hussain and Rajiv Pratap Rudy were at Gandhi Maidan to supervise the final preparations for Sunday's rally.
Giving details of the programme, Yadav said BJP President Rajnath Singh and leader of Opposition in Rajya Sabha Arun Jaitley will arrive in Patna tonight. Narendra Modi will come on Sunday around 1pm from Ahmedabad by a special plane.
Narendra Modi will come straightway to the venue from Jayprakash Narayan Airport to address the rally and would fly out after two hours, he said.