Sonia will share the dais with Karunanidhi at a meeting scheduled in Chennai on May five, TNCC President E V K S Elangovan told reporters here.
Rahul would address an election meeting at Chennai on May 7 and in Coimbatore and Madurai the same day, he said.
The TNCC President and Congress candidates and senior leaders were here to inspect the VOC Grounds where Gandhi is scheduled to address the meeting.
Asked about the prospects for the alliance, he said this election would prove to be the 'death knell' of AIADMK.
With massive support from people from all sections of society, there was no doubt that the alliance would have a landslide victory, winning more than 210 seats, he said.