The self-appointed leader of the People's Democratic Reform Committee took to the stage at Democracy Monument to declare another push to uproot the so-called "Thaksin regime", urging people to come out and protest en masse on Sunday.
"Dec 22 is the day when all will rally to officially oust Yingluck Shinawatra from the prime minister's post,'' he said.
The rally has been scheduled to take place one day before the Election Commission begins registering list-MP candidates on Dec 23-27, followed by constituency seat candidates from Dec 28-Jan 1.
Mr Suthep urged his supporters to come out on Thursday and Friday for a rehearsal of the planned rally and then to rest on Saturday in preparation for the march.
The general election date is set to take place on Feb 2 next year.
But Mr Suthep has promised to derail the polls because the PDRC wants political reform to be undertaken before the country elects a new government.
Protesters backing the PDRC are using Democracy Monument at Ratchadamnoen Avenue as their protest base. They want Ms Yingluck to resign to clear the way for a royally-appointed premier to run the country while political reforms take place.
The caretaker prime minister insisted on Tuesday that she will not step down until a new government is formed after the election.