Halloween in Spain isn't like Halloween in America, unfortunately.
Ok, we are changing the traditions and ideas, and every year, more shops sell halloween stuff, but only simple things, like brooms, witch hats, masks or plastic pumpkins, but any more...
People doesn't decorate their houses, but young people usually do halloween parties at home, where we tell scary stories while we hear some halloween music.
You can also go to the disco with your costume, but I think that isn't the "halloween atmosphere"...