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Description
Correct date is Saturday between 31 Oct and 6 Nov, since 1955 or 1956, the two references below seem to disagree about the exact year. Before that 1st Sunday of November since 1774.
http://www.timeanddate.com/holidays/finland/all-saints
https://fi.wikipedia.org/wiki/Pyh%C3%A4inp%C3%A4iv%C3%A4