Every year I do this to remember and honour the day when Denmark got liberated from the 2nd World War.
The candles in the windows are an old tradition, which started on that very evening in 1945 when the Danish people was told by radio, that the war was over. People started to tear down their blackout curtains, which had allowed no light to get out at night. Instead of the curtains they put candles in their windows to celebrate that the war had ended.
Hmmm......hopefully next year I will remember!