White night
In the summer, the lady of the North comes for a few days. She stops the sun from descending below the horizon and prohibits the sky to grow dark. Those magical nights become indistinguishable from day and the night terrors can be left behind. Celebration of light begins with exalting an inner light over spiritual darkness. When festivity reaches its peak, you can see the triumph of good over evil. At that time the lady of the North begins her journey back home. And when the sky is darkening again she vanishes without a trace.