Ivan Kupala Day (Midsummer) Kupala Night, also known as Ivan Kupala Day. It is celebrated on the night of 23/24 June. Calendar-wise, it is opposite to the winter holiday Koliada. The celebration relates to the summer solstice when nights are the shortest and includes a number of Slavic rituals.
ivan kupala by the river
NOC KUPALY - Szukaj w Google
Henryk Siemiradzki, Noc Iwana Kupały (Noc Świętojańska)