While the Left parties announced they are staying away, the JD(U) also gave hints that it may follow suit. Congress is part of the JD(U)-led Nitish Kumar government in Bihar.
There was no immediate word from SP and BSP, while NCP's Tariq Anwar, who was to attend, is unable to come to Delhi as he had to cancel his plans due to his mother's death in Patna.
"Whoever comes tomorrow will come. Those who don't come tomorrow will come the next time. Those who will come, you will see tomorrow," said Ramesh striking a philosophical note.
He, however, dismissed suggestions that tomorrow's meeting was a "tea party" like the one in 1998 which ultimately led to the downfall of the Vajpayee government.
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Ramesh said, "The biggest issue today is demonetisation and the second issue is corruption by the Prime Minister, which will be the main issues before tomorrow's meet."
A senior party leader, who declined to be identified, likened tomorrow's parleys with that of the Shimla conclave in 2003 which saw Congress pitching for unity of secular forces to oust the then NDA government led by Vajpayee.
The meeting is seen as an attempt on the part of the Congress to paper over the cracks that developed when several Opposition parties skipped the joint Opposition march to Rashtrapati Bhawan on December 16 over demonetisation.
West Bengal Chief Minister and TMC supremo Mamata
Banerjee, who has been vocal against demonetisation, will attend tomorrow's meeting, sources said.
She will attend the briefing at Constitution Club along with other Opposition leaders including representatives from DMK and RJD, sources added.
Yechury said, "Most of the parties were neither consulted nor informed about what will be the agenda of the meeting. Several Opposition parties have reservation about the way the meeting has been convened."
"Lack of such prior consultation and discussion has caused difficulties. We could have got an opportunity to discuss within our parties and taking a position," he said, adding that all parties have already made their own plans.
JD(U) spokesperson K C Tyagi said, "The meeting has no agenda, not even a common minimum programme. It is unlikely to arrive at any conclusion."
He did not give a direct reply on whether his party will attend the exercise. Sources, however, said the Nitish Kumar-led party won't attend it. Tyagi noted that Mamata Banerjee-led TMC, which will attend the meeting, has a different view on demonetisation than other parties'.
The Opposition meet is being held at a time when the Narendra Modi dispensation has completed half its term and the ruling BJP is going whole hog to capture key Uttar Pradesh, where Assembly polls will take place in few months.
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Meanwhile, taking potshots at Congress after over decisions of several parties to keep away from the meeting, BJP said the balloon of their "so-called unity" has burst even before it could have floated.