Although mainly an American holiday, almost every country has some form of celebration in one way or another to remember or connect with the souls, spirits, or hollows of those who have passed.
Halloween’s origins apparently date from the ancient pagan Celtic festival of Samhain, which later was adopted by Christians who then spread it widely. In a lot of European and South American countries, All Saints’ Day (celebrated November 1) has a more important and religious place than Halloween. Because Halloween is not part of many other countries’ more traditional cultures, some people object to it even being celebrated at all.
So, if you are studying abroad over Halloween, it is a good idea to research what could be going on in your host country on those dates!