Halloween

Halloween (or Hallowe'en) is an annual holiday observed on October 31, primarily in the United States, Canada, Ireland, and the United Kingdom. It has roots in the Celtic festival of Samhain and the Christian holiday All Saints' Day, but is today largely a secular celebration.

Common Halloween activities include trick-or-treating, wearing costumes and attending costume parties, carving jack-o'-lanterns, ghost tours, bonfires, apple bobbing, visiting haunted attractions, committing pranks, telling ghost stories or other frightening tales, and watching horror films.

Interestingly, there are costume-shops that sell berets (!) specifically for Halloween (and I  mean very plain, black berets; not these rather unconventional pumpkin shaped berets)...