The student movement aims to end Vucic's 14 years of rule at Sunday's vote, as he holds a rival rally across town.
Some countries in the region say it infringes on their rights.
Some of the core issues that drove Trump's US supporters and the MAGA movement are no longer Republican talking points.
The Meta boss had said he would exit the state over a wealth tax that has not yet come into force.
The three waves of Russian missiles were launched at hours after Russia said it was "ready in principle" to resume peace talks with the US and Ukraine.
Protests will only be allowed in some towns and cities if organised by unions, and top museums will be closed on Saturday.
The influencer, whose real name is Braden Peters, is accused of sexually assaulting a 17-year-old girl in 2025.