The book The Worship of the Dead points to this origin: “The mythologies of all the ancient nations are interwoven with the events of the Deluge . . . The force of this argument is illustrated by the fact of the observance of a great festival of the dead in commemoration of the event, not only by nations more or less in communication with each other, but by others widely separated, both by the ocean and by centuries of time. This festival is, moreover, held by all on or about the very day on which, according to the Mosaic account, the Deluge took place, viz., the seventeenth day of the second month—the month nearly corresponding with our November.” (London, 1904, Colonel J. Garnier, p. 4) Thus these celebrations actually began with an honoring of people whom God had destroyed because of their badness in Noah’s day.—Gen. 6:5-7; 7:11.