How do you say Happy Halloween in one of the Swiss languages?

Geisterjagd or Ghost Hunt might be a good one. they have a Klausjagen ( Claus-Hunt) a parade of various St. Nick characters (not in red and white get-up) on Dec .6. so Geisterjagd or Ghost Hunt- like the sound of that. a spooky Jag indeed! Jag meaning entertainment originally was a verb meaning to hunt- not so light-hearted was the Judenjagd or (Jew Hunt) an apb ( all points bulletin) alert by the Gestapo and SS units. Jag, not the car- originally meant (Hunt) as a verb.