I was wondering if any restaurants are open on Christmas Day? Arrived in Opole not too long ago and well, want to have a proper "English" Christmas Dinner?!
27 - 30th should be business as usual, though in one horse towns, be careful if there's only one kantor who has inexplicably decided to take his holidays then. Bring your cashpoint card just in case. Anyway, you may get a slightly better rate from the cashpoint (answer no if the machine offers a fixed rate - this is a rip off) than at some kantors, especially 24 hour ones which are notoriously bad.