Washing in May Dew
Edinburgh and Perth in Henderson’s account
He names Arthur’s Seat in Edinburgh and Kinnoul Hill in Perth. The gathering is tied to May Day morning rather than any morning in spring.
William Henderson, Notes on the Folk-Lore of the Northern Counties of England and the Borders, 1879, Chapter II, Days and Seasons; May Day paragraph beginning “On May Day morning in Edinburgh”
A May morning custom involved washing the face in dew and climbing hills before sunrise.