Here in Germany we only have Carnival, which has the partying and the costumes, but no trick or treating. Also, it is during Spring, not during Fall.
To be honest, while I like Halloween episodes like with COmmunity or Simpsons etc..
I do rather dislike any attempt to celebrate Halloween or Trick or Treating here, it is after all an American custom, an American tradition and not at all rooted in my countries culture.