Top leaders of 26 opposition parties, including the Congress, Aam Aadmi Party and Trinamool Congress, are expected to attend the two-day brainstorming session in Bengaluru from today. One of the most important tasks at the hands of these parties is to set the ball rolling on a possible Common Minimum Programme that can help them function smoothly, address their political compulsions and the few ideological contradictions that exist among them. Congress leaders have said that a sub-committee will also be formed for the same.