The protest is a reaction to a bill that would stifle free expression. HuffPo explains:
Bill 78 is being called a draconian attempt to quell massive student protests that have taken over Quebec streets for more than 100 days. The bill limits the ability to protest by requiring groups to get police approval for demonstrations and restricting where they can take place, among other provisions.
People took up the percussive protest Thursday night in several towns and cities including Sorel, Longueuil, Chambly, Repentigny, Trois-Rivieres and even in Abitibi—several hundred kilometres away from the hot spot of Montreal.