The demonstrations come amid an increasingly febrile political climate, with presidential elections six months away and far-right leader Marine Le Pen leading opinion polls, AFP reported.
President Emmanuel Macron said this week that it was “not normal” for France to be in such a state of “turmoil” so close to a presidential election.
Around 70,000 security personnel will be deployed on Saturday, matching the number mobilized a week ago, as authorities seek to prevent a repeat of the unrest on Oct 17.
More than 40 metro stations will be closed in the capital, while tram services will also be disrupted.
An aide to Interior Minister Laurent Nunez said authorities expected street violence on a scale “comparable” to the unrest two weeks ago, when images of clashes, looted shops and public buildings set ablaze were broadcast around the world.
The protest movement brings together Yellow Vest activists, trade unions, and high school and university students. It initially focused on the rising cost of living, inequality and deteriorating learning conditions.
However, following a security clampdown and serious injuries to some protesters, the movement broadened its demands to include greater protection of civil liberties and the right to protest.
A police source pointed to “considerable nervousness” among the authorities.
“There is no reason to think this will go smoothly,” the source said.
Alain Di Crescenzo, president of France’s chamber of commerce, said business owners were worried.
“Shopkeepers can’t wait for Saturday to be over,” Di Crescenzo told broadcaster France Inter.
“The information we have is that Halloween is not helping matters, because we’re going to have people wearing masks.”
Ahead of the protests, some shops and other businesses across France boarded up their storefronts.
“Behind these boards, there is neither power nor an enemy. Just a family and its work,” read a message scrawled in black across the plywood protecting a Paris business.
The interior minister warned on Thursday of a “very high risk of public disorder”, saying demonstrations would be allowed, but not in city centres.
The Paris police prefecture sought to prevent demonstrators from marching between Bastille and Nation in eastern Paris, but a court overturned the ban.
Nunez said authorities had detected social media calls for Halloween gatherings on Saturday evening, urging protesters to spark a “revolution”.
Some social media posts called on people to dress up and gather for a “night of darkness”.
Nunez warned that protesters would not be allowed to wear masks concealing their faces.
On Friday, customers crowded into a costume shop in Paris, but manager Didier Jarsale said it was not his job to “ask every customer what they intend to do with what they buy”.
“We’re not here to act as police officers,” he said.
Authorities have acknowledged security and intelligence failures that helped pave the way for the clashes, widespread looting and vandalism that erupted on Oct 17.
Since then, they have moved to reassert control by restricting demonstrations and imposing curfews in several cities.
A night-time curfew will be imposed in the Republique and Chatelet-Les Halles neighborhoods of Paris from 11 pm to 6 am on Saturday and Sunday.
More than 1,000 municipal workers will be mobilized in Paris over the weekend to clean public spaces, the mayor’s office said.
The unrest followed weeks of demonstrations by high school students campaigning for better learning conditions.
Amid the cost-of-living protests, the country was also shaken last week by a shooting outside Paris that killed one person and wounded seven others, including an 11-year-old girl. Most of the victims were from foreign backgrounds.
The attack has prompted rallies against the normalization of racist hatred.