Existing political parties are stepping up calls for the regime's ban on political activities to be totally lifted in light of its partial revocation on April 1.
They are expected to turn up the heat on the regime at a meeting on March 28 and press for clarity on "the dos and don'ts" for next month.
Established parties have said they will attend the meeting in which the Election Commission will explain the legal changes.
The National Council for Peace and Order (NCPO) will also send its representatives to the meeting.
Activities which are permitted from April include updating party memberships.
Pheu Thai Party secretary-general, Phumtham Wechayachai, said his party will attend the meeting and called for a swift rescinding of the ban to allow Thai politics to proceed smoothly.
The party wants the NCPO to give a precise timeframe regarding the full resumption of political activity in Thailand, he said.
Nikorn Chamnong, director of the Chartthaipattana Party, said its party leader Thira Wongsamut, and party figure Varawut Silpa-archa, will attend the March 28 meeting.
The party plans to ask the NCPO representatives how it can proceed without contravening the current rules, he said.
Democrat Party leader Abhisit Vejjajiva told the Bangkok Post that he will also attend the meeting to discuss the matter with the EC.
He said that they must answer questions raised by parties which have doubts about the practicality of the law as it stands, rather than just telling them what to do.
In light of this, Mr Abhisit said he was not sure if the meeting would remove the parties' doubts.
For example, the law on political parties does not require party members to produce copies of ID cards and household registration books to confirm membership, Mr Abhisit said.
He said that the rules should be relaxed to allow documents to be sent electronically, but the EC had not given any answers about this so far.
Mr Abhisit said he hoped they will receive clear answers before April 1 when existing parties will be allowed to update their memberships.
"On some issues, it [the EC] refused to answer me. It said it would wait for answers from the NCPO," Mr Abhisit said.
Bhumjaithai's deputy secretary-general, Supachai Jaisamut, said that leader Anutin Charnvirakul and other executives will seek clarity on certain unsettled legal issues.
EC chairman Supachai Somcharoen said, "there will be answers to all questions" from existing parties.
He was speaking after meeting Deputy Prime Minister Wissanu Krea-ngam to discuss preparations for the gathering.
However, he said that the issue of lifting the NCPO ban on political activities was not discussed.
Mr Supachai said that party meetings will be allowed only after the organic bill on the election of MPs becomes law, in accordance with the terms of the original the NCPO ban.
"It is up to Prime Minister Prayut Chan-o-cha, as the NCPO chief, to decide when to lift the political restrictions," Mr Supachai said.
The bill on the election of MPs has now passed the National Legislative Assembly and once it is submitted to Gen Prayut, he will have five days to decide whether to petition the Constitutional Court for a validity check or forward the bill for royal endorsement.
Gen Prayut, as the NCPO chief, issued a Section 44 order on Dec 22 to amend the new organic law on political parties.
It extended certain deadlines for parties to complete processes required by the organic law, which took effect on Oct 8.
Members of existing parties are required to confirm membership and pay membership fees between April 1-30, or they will lose their status.
Furthermore, existing parties must prove within 180 days of April 1 that they have at least 500 members, finish collecting membership fees and register seed funds of no less than 1 million baht.
This is an extension of the original deadline of 180 days from Oct 8.
However, the ban on other political activities, such as party meetings, campaigning and political gatherings, remains in place.
Meanwhile, NCPO spokesman Piyapong Klinpan Friday warned pro-election groups which plan to stage gatherings at the Royal Thai Army headquarters on Ratchadamnoen Avenue today.
The NCPO is monitoring the groups' activities, Maj Gen Piyapong said.
However, they could face legal action if they are not careful about how they present their gatherings, he added.