With CPI and VCK already announcing their participation in the meet, it has opened up possibilities of a political realignment ahead of the 2019 Lok Sabha polls.
CPI(M) State Secretary G Ramakrishnan said the party's executive council has decided to participate in the meeting.
The decision is significant since CPI(M) was against participating in a similar meeting convened by DMK on October 25 last.
Due to the Marxist party's stand, VCK and CPI, other constituents of the People's Welfare Front, did not participate in it though they were inclined.
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However, the parties had played down the differences, saying they could still work together on "people's issues."
Ramakrishnan cited drought and Centre "declining" to constitute Cauvery Management Board in support of the decision to take part in the DMK organised meet.
He also referred to alleged farmer suicides in Tamil Nadu in a statement here.
On April 13, DMK working president M K Stalin had called an "all party meeting," to discuss the woes of State's farmers.
DMK had convened a similar meeting of parties to discuss the Cauvery issue on October 25 last.