City Walks Greater Copenhagen: Midsummer/Sankt Hans
This event is organized by Science City Lyngby.
Sankt Hans is a Christian holiday; however, it coincides with an ancient Pagan tradition, summer solstice, the longest day of the year. On this evening most Danes get together around a huge bonfire. Often by the sea.
A warm recommendation would be to go to the sea and enjoy the Danish midsummer party Sankt Hans. The excact time and venue will be announced when the event is closer as there are plenty of locations to choose among.