Homesick American student travelers are most apt to find Halloween parties in Americanized areas or in
hostels, where other backpackers, inquisitive by nature, may be willing to learn about Western traditions, but where folks may also
jeer at perceived Americanization of the planet or take offense at a perceived overly casual attitude toward what is often considered a time meant for
honoring the dead, not dressing up like a corpse.
Halloween Celebration Tips:
If you're traveling out of the US on Halloween, do learn about what happens in the rest of the world on October 31st and November 1st (a cool part of travel is learning to be considerate of others' beliefs -- with a little knowledge, you won't assume that what you do in the US is remotely similar to what others do elsewhere on October 31).
If you're planning to throw back some witch's brew of the spiked variety, ensure that you know what the legal drinking age is in the country which you are visiting, as it might matter.
Online Halloween costume shops: Hollywood's Halloween Town, New York City's Gothic Renaisance, New Orleans' shop locations, Salem's online Samantha's and extremely Extreme Halloween.
Happy haunting!