"The Trinamool and CPI(M) are spreading canards against the rally by Narendra Modi's by questioning our source of funds and saying that money is being charged for those booking seats online. These are false and intended to disrupt our rally," West Bengal state BJP president Rahul Sinha said at a party function.
Sinha said till now over 18,000 people have registered online for seats.
Modi's rally will be one of the biggest rally at the Brigade Parade Ground.
He said that from February one party supporters and fans of the Gujarat chief minister would sport Modi masks at the Kolkata Book fair to raise awareness about the rally.
"Narendra Modi's rally will be one of the biggest and a historic rally that the Brigade Parade Ground has ever witnessed," Sinha claimed.
Several retired IAS and IPS officers joined the party as also former Trinamool Congress MP Bikram Sarkar during the day.