Halloween Day. Halloween is an annual holiday celebrated on october 31st across the world, which is also the night before all saints’ day in western christianity. Either way halloween is a day that has both deep tradition and lighthearted fun.

Here’s all you need to know about the date, history, significance and celebration of halloween Halloween as we know it is a secular celebration with roots in the celtic harvest festival of samhain, which was observed in ancient britain and ireland on november 1st.