Holloween is a holiday celebrated on the night of October 31. Common Halloween activities include trick-or-treating, ghost tours, bonfires, costume parties, visiting "haunted houses", carving Jack-o'-lanterns, reading scary stories and watching horror movies. Halloween did not become a holiday in the United States until the 19th century, where lingering Puritan tradition restricted the observance of many holidays. American almanacs of the late 18th and early 19th centuries do not include Halloween in their lists of holidays. The transatlantic migration of nearly two million Irish following the Irish Potato Famine finally brought the holiday to the United States. Scottish emigration, primarily to Canada before 1870 and to the United States thereafter, brought the Scottish version of the holiday to each country. The main event for children of modern Halloween in the United States and Canada is trick-or-treating, in which children disguise themselves in costumes and go door-to-door in their neighborhoods, ringing each doorbell and yelling "trick or treat!" to solicit a gift of candy or similar items.