Two things in the atlas are tied to this date. Each is placed here by a source that gives the day.
Harry Houdini died in Detroit on 31 October 1926, Halloween. His wife Bess later held yearly Halloween séances hoping for a coded message from him.
On 31 October 1992 the BBC aired Ghostwatch, a staged programme presented as a live investigation of a haunted house in Northolt. Many viewers took it for real, according to a crew member.