Besides Ireland and parts of the UK Halloween traditionally hasn't been a thing in Europe and some people are adamantly against it being celebrated. But here in Switzerland in the recent years it's become the night where teenagers/students go out late and vandalize and be nuisances, start fires, etc.

This year it's on a Saturday and there's also general unrest with frequent protests (Israel/Palestine, Kurds, students, etc etc etc) so it's probably going to be worse than usual.