MIDSUMMER KUPALA NIGHT is a Slavic feast associated with the summer solstice of the Sun, celebrated in the shortest night of the year. This is festival of water and fire. On June 21, 2015 in Poznan, Poland near the Warta River, this feast was also a flash mob in which participants have released one thousand lanterns into the sky. It is one of the most romantic nights in Poland every year. June Solstice in Universal Coordinated Time is on Monday, June 20, 2016 at 22:34 UTC