PDRC leader Suthep Thaugsuban met labour unions of several state enterprises Wednesday to discuss plans.
PDRC spokesman Akanat Promphan described the state enterprises as powerful forces free from the influence of the Thaksin regime.
The PDRC will visit various finance, transport and utilities state enterprises to share the aims of national reform and strengthen their ties with the people, he said.
Last week the PDRC rallied at various ministries and met their permanent secretaries.
Mr Suthep told his supporters he believed the PDRC would "receive victory" by the end of this month.
Earlier this month the PDRC leader called a major gathering for the day on which the Constitutional Court is expected to rule on caretaker Prime Minister Yingluck Shinawatra's role in transferring National Security Council secretery-general Thawil Pliensri.
Meanwhile, a Pheu Thai source said the party's northeastern members had discussed the political situation after Songkran, and likened the current fighting to the final round in a boxing bout.
The National Anti-Corruption Commission (NACC) earlier resolved to press charges against 308 out of a total 381 lawmakers accused of misconduct in connection with the draft bill on charter amendment.
If found guilty, the NACC will forward their cases to the Senate to impeach them and then ban them from politics for five years.
However, the source was not convinced that all the 308 lawmakers would be indicted.
About 70 former Pheu Thai MPs could be spared, the source said.
If the premier, cabinet members and MPs are indicted, political attacks will be mounted against Pheu Thai to weaken the party in the interim before a new poll takes place, the source said.
A new alternative party, consisting of prominent figures and former MPs, could be set up to grab votes from Pheu Thai.
This approach could also be aimed at preventing the Pheu Thai Party from forming a new government once the new election is held.
The source expected the United Front for Democracy against Dictatorship (UDD) and the PDRC would still be active but the government would be able to contain the situation.
As for the UDD's mass rally on Friday when court deliberates Ms Yingluck's status, the source believed the turnout would be greater than for the UDD rally at Aksa Road earlier this month.
NSC secretary-general Paradorn Pattanatabut played down the likelihood of more serious incidents as the charter court would probably seek more information from the parties concerned before making a ruling.