Trinamul sources said on Thursday that the Bahujan Samaj Party has confirmed its senior leader Satish Chandra Mishra would attend the Opposition rally in Calcutta on Saturday.
'We have just received confirmation from the BSP that its all-India general secretary Satish Chandra Mishra will attend the Opposition rally on January 19,' a senior TMC leader said.
With the BSP confirming attendance, almost all major Opposition parties - the Congress, NCP, National Conference, SP, AAP, DMK, JD(S) and the TDP - would participate in the rally, a TMC leader said.
Left parties led by the CPM have decided not to attend it.
Bengal chief minister Mamata Banerjee, the main mover behind the event, earlier this week said senior Congress leader Mallikarjun Kharge will represent his party.
The Trinamul leadership claimed in a tweet that Saturday's 'rally of all rallies' will sound the 'death knell' for the BJP government at the Centre. 'To pave the way for a much needed change for the better of our great nation.'
In a show of strength ahead of the general election, the rally that likely to see the participation of lakhs of Mamata's supporters at the Brigade Parade Grounds in central Calcutta.