How we actually solve that problem (at least over here in Poland) is by excluding the weirder holidays from the electronic schedule altogether and deactivating

How we actually solve that problem (at least over here in Poland) is by excluding the weirder holidays from the electronic schedule altogether and deactivating all the arrival time boards and such. If you're lucky, there are cardboard signs explaining all the holiday rules at each stop, there may also be a PDF on the operator's website.