BELGRADE, Serbia — Tens of thousands of students and other opponents of Serbia's populist president are converging on the northern city of Novi Sad for the massive commemoration of the victims of a tragedy a year ago that killed 16 people.

Ahead of the commemorative rally, momentum has been building in favor of opposition demands for major changes in the Balkan country, after nearly a year of student-led anti-government protests that have seriously shaken President Aleksandar Vucic and his firm grip on power.

As thousands of protesters arrive in Novi Sad from all over the country, Vucic has threatened mass arrests if the mourners turn to violence, and defiantly said his supporters are planning “a much bigger” rally in the city later in November.

He has also tried to downplay the expecte

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