NDP Leader Jagmeet Singh has also confirmed he will be at a climate change march in Victoria, B.C.
Conservative Leader Andrew Scheer will not be taking part in “any climate event,” according to a party spokesperson.
The Montreal rally, which is expected to attract hundreds of thousands of protesters, will start at the George-Étienne Cartier statue in Mount-Royal Park at 12 p.m.
Montreal police say traffic will be difficult in the area between Berri, Peel, St-Joseph and de la Commune Streets.
The protest is expected to end at the base of the Bonaventure Expressway.
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Police would not divulge details on the force’s strategy for the march nor the number of officers that will be on hand during the demonstration.
However, the force noted that security will be the responsibility of the event’s organizers and that officers will only be on hand to intervene if needed.
Several educational institutions have already announced they will be cancelling classes to allow students to attend the march.
Dawson College, Cégep du Vieux Montréal and John Abbott College are among the CEGEPs that are cancelling classes for the day to allow students to participate in the rally. Some CEGEP teachers unions have also voted to strike that day.
The province’s largest school board, the Commission scolaire de Montréal (CSDM), will also be cancelling classes for its elementary and high school students and turning Friday into a pedagogical (PED) day.
Other school boards, including the English Montreal School Board and the Commission scolaire Marguerite-Bourgeoys, will not be following in the CSDM’s footsteps, saying it will be business as usual in their classrooms.
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The Lester B. Pearson School Board noted that Sept. 27 was already a designated PED day for its elementary and high school students.
In response to the mass cancellation of classes, Quebec Education Minister Jean-François Roberge insisted the best way for students to fight the climate crisis is to simply stay in school on Sept. 27.
“The best way to fight climate change is to go to school. Of course, the solutions are in the school, but in Quebec, we have the right to express ourselves to go in the street and say what we want to say,” he said Wednesday.
“It’s a free country. It’s a free province and it will stay that way.”
Public transit across Greater Montreal will be free on Friday as a show of support for the climate march.
WATCH: Quebecers want government to do more to save the environment
“We will be waiting for you by our sides for the future of the planet,” Montreal Mayor Valérie Plante announced.
After the march, Thunberg, a prominent voice in the fight against the climate crisis, has been invited to city hall to receive a key to the city from the mayor.
There are no plans for the 16-year-old to meet with Quebec Premier François Legault during her visit.
According to several activist groups, at least 860 cities around the world have demonstrations planned this Friday.