Halloween is a holiday celebrated on October 31. It has roots in the Celtic festival of Samhain and the Christian holy day of All Saints Day. It is largely a secular celebration, but some Christians and pagans have expressed strong feelings about its religious overtones. Irish immigrants carried versions of the tradition to North America during Irelands Great Famine of 1846. The day is often associated with the colors orange and black, and is strongly associated with symbols such as the jack-o-lantern.