Recurrence pattern: every year on November 29.

Isdal Woman Day is observed worldwide every November 29 to commemorate the discovery of the body of an unidentified woman in Isdalen, Bergen, Norway, in 1970. The day honors the memory of individuals who have died under mysterious circumstances and highlights unsolved cases involving unidentified victims. The Isdal Woman, whose identity remains unknown, was found with her body burned and no identifying marks on her belongings. Despite extensive investigations, including an autopsy revealing her cause of death, the case was closed as a suicide. The origins of Isdal Woman Day are unclear, but participants typically engage in activities such as researching unsolved mysteries, listening to true crime podcasts, and using the hashtag #IsdalWomanDay on social media. The day serves to encourage further exploration into these unresolved cases, fostering a community of interest around them.