If you want to know what day is most holy in secular Sweden I can tell you. On my island the longest day already is here and the night is just an hour long.
People get crazy.
They eat salted and pickled herring and fresh potatoes, they drink vodka, they dance around a maypole, they drink vodka, they eat more herring, they drink more vodka. They are still alive after a long winter. Couples leave the parties. You see a man with a girl in one hand and a bottle in the other heading to their own spot in a field with flowers or a soft granite rock by the sea. And they drink and produce babies this light night out there in nature.