More than 30,000 people have marched in Pretoria calling on South African President Jacob Zuma to quit, keeping up pressure on the leader over his handling of the struggling economy.
The protesters marched through the city and held a rally at a field outside the Union Buildings, the site of Zuma's offices.
Zuma, who turned 75 on Wednesday, has survived previous protests but the main opposition party Democratic Alliance (DA) and other parties behind the protest believe they can drum up support to force Zuma out of office following his dismissal of respected Finance Minister Pravin Gordhan in a cabinet reshuffle.
South Africa's parliament said on Wednesday a motion of no-confidence in President Zuma has been postponed until a court decides whether the vote should be taken by secret ballot.
Opposition parties have said that a no-confidence vote could have a chance of success if it is held by secret ballot, but the ruling African National Congress party, which has a majority in parliament, has said it will vote against it.
South Africa's economy has grown lethargically over the last six years and the jobless rate stands near record levels.
The ruling African National Congress (ANC) party has rejected calls for Zuma to step down. He has denied repeated allegations of corruption since winning power in 2009 and more than 60,000 people marched on Friday calling for him to quit.
The ultra-left Economic Freedom Fighters and other parties took part in Wednesday's protest, dubbed "National Day of Action".
"He is misusing state money," said 21-year-old student and Pretoria resident Thomas Monyoko wearing a red EFF T-shirt.
"Let the message be clear today that Zuma is no longer a credible president of South Africa," Economic Freedom Fighters leader Julius Malema said.
"We don't care whether you are white, whether you are Indian, whether you are black, we are here to defend the future of our children."
Zuma had accused Friday's marchers of having racist motives. Like Friday, a mixed racial profile of people attended Wednesday's rallies but there were less white people.
The rand climbed to a one-week high on Wednesday, in part encouraged by comments from the new finance minister indicating no significant change in policy.