Midsummer celebration !
The evening of June 23rd is celebrated in Denmark with bonfires as the following day is the birthday of John the Baptist. It is however linked closely to the celebration of Mid Summer, and as such considered to be a spiritually powerful evening where evil forces such as witches would like to play their faul games. The bonfires are lit to keep these evil forces away, so you see this evening is connected both to Christianity and superstition, and one might say that we're 'playing it safe' !
Last year on 23/6 I visited friends in Gudhjem on Bornholm where this photo was taken.