vectorial8192
Only reasonable reference that I could find is this https://saikungbuzzblog.wordpress.com/2017/09/12/next-hash-run-this-saturday/

Then, ref: https://wiki.openstreetmap.org/wiki/Notes

Please do not use notes for general discussion or storing information not otherwise used in OpenStreetMap. For example never create notes such as "I was here on Saturday" or "There was a crime at this location".

Also, this is obviously extra old info and should be irrelevant to recent years.

Therefore, resolving.