I know for instance asking several Polish kids attending Polish schools that at school they do nothing for Halloween.
I think it happens often that they want to, or, for example, English teachers want to organize something like this, but the school principal disagrees.
The case is that Halloween is just a day before the All Saints' Day, which is a holiday of a totally different character. These two holidays somehow doesn't fit to each other. All Saints' Day isn't supposed to be fun, it's a day of reminding about those who have passed away. For some people it's just pain in the ass, they don't like it, and when they are able to, they ban it.
What is interesting here, that Slavs in the pre-Christian times also used to have something like Halloween (called Dziady), and the All Saints' Day has simply replaced that. As far as I know, it used to be still celebrated in some village areas, especially in the eastern Poland, in the XVIII, maybe even XIX century. In Mickiewicz's times (the most important Polish poet of the romanticism era, and, according to a lot of people, the most important one at all - he liked to come back to such old-Slavic customs or legends), so in the XIX century, it was disappearing, but there were places where it still existed.