Sankt Hans Aften
In Denmark, the solstice is tied to the feast of Saint John the Baptist, known in Denmark as Sankt Hans (“Hans” being the diminutive for Johannes, or John), who was supposedly born on June 24th. Because Danes like celebrating the eves of things (a sneaky way to make holidays longer, I suspect! Tip of the hat to you, Denmark), that means June 23rd is marked as Sankt Hans Aften.
Here are several links that will provide more information on Sankt Hams Aften