Protesters are showing solidarity with Genevieve Legay, a 73-year-old anti-globalisation activist who suffered a head injury in the southern city of Nice last weekend.
The parade is the first major event since the city was attacked during Bastille Day celebrations last year that left 86 people dead.
Cedric Herrou helped refugees from Africa illegally cross the border from Italy and gave them shelter in his home. A court in Nice convicted him on Friday in a case that has divided opinion in France.
Two teenage girls are being held in France on suspicion of plotting a terror attack directed by a French DAESH member.
The bans on the full-body bathing suit had outraged rights defenders worldwide.
National mourning in Nice, France continues with commemoration honouring the victims of the truck attack.
The attack in Nice, which has claimed at least 84 lives, is the deadliest attack to involve a vehicle ramming innocent people, but not the first of its kind.
The attacker has been identified as a 31-year-old Tunisian-born Frenchman Mohamed Lahouaiej Bouhlel, who was known to police for petty crimes.
A vehicle, stocked with guns and grenades, rammed into crowds watching a fireworks display during Bastille Day celebrations, killing dozens.
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