The Dravidian party's allies, Congress and IUML, confirmed their participation for the Tuesday meeting, even as BJP had already ruled out its presence if DMK held such a meeting.
Stalin said that the October 25 meeting was being held following pleas from various quarters, including Cauvery delta farmers and public to "exert serial pressure" on the Cauvery issue.
"The meeting has been convened (under him) as Opposition Leader at (DMK headquarters) Anna Arivalayam on October 25 at 10.30 am," Stalin said his letter to different parties.
Further, the prospects of current Samba crop in the Cauvery delta districts was also under question due to the low storage levels at Mettur dam, he said.
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Even if Karnataka fully complied with the latest Supreme Court order, asking it to release 2,000 cusecs of water, the prospects of Samba did not look bright, Stalin said.
Meanwhile, DMK's allies, Congress and IUML, expressed their support for the meeting.
TNCC President Su Thirunavukkarasar said that he would participate in the meeting.
BJP's state unit, which has been critical of both Congress and DMK on the Cauvery issue, had already ruled out its participation if the latter convened an all-party meeting.
State unit President Tamilisai Sounderrajan had earlier said her party would participate only in a government convened all-party meeting as it was not DMK's responsibility to do so.
After allowing different quantum of water release, the Apex Court had on October 18 asked Karnataka to release 2,000 cusecs of water to Tamil Nadu till further orders.
The BJP government at the Centre has also been facing flak in Tamil Nadu for seeking a modification of the Supreme Court directive to it on constituting the CMB.