Halloween costume parties, trick-or-treat tradition, ghostly street processions, pranks and more customs are set to mark Halloween  celebrations on Oct. 31.

At many places across the world, Halloween fundraising events have already begun; celebrities Halloween costumes are a growing craze; costumed performers are being seen walking on streets, and spookiness is in the air.

A recent report by Reuters cites that a stalled economy hasn't spooked Americans out of enjoying Halloween. The report has stated that about three-quarters of U.S. consumers plan to celebrate, but will spend less this year on Halloween costumes and candy.

What the royals were doing as the countdown to Halloween began, and what they are up to next around Halloween? Start the slideshow to find out.