Ivan Kupala Day (Belarus, Poland, Russia, Ukraine)

Kupala Night is one of the major folk holidays in some of the Slavic countries that coincides with the Christian feast of the Nativity of St. John the Baptist and the East Slavic feast of Saint John's Eve. In folk tradition, it was revered as the day of the summer solstice and was originally celebrated on the shortest night of the year, which is on 21-22 or 23-24 of June in Czechia, Poland, Slovakia, Bulgaria, and modern Ukraine. Following the Julian calendar, it is celebrated on the night between 6 and 7 July in Belarus, Russia, and parts of Ukraine. The name of the holiday is ultimately derived from the Proto-Slavic word *kǫpati, meaning "to bathe".

Belarus, officially the Republic of Belarus, is a landlocked country in Eastern Europe. It is bordered by Russia to the east and northeast, Ukraine to the south, Poland to the west, and Lithuania and Latvia to the northwest. Belarus spans an area of 207,600 square kilometres (80,200 sq mi) with a population of 9.1 million. The country has a hemiboreal climate and is administratively divided into six regions. Minsk is the capital and largest city; it is administered separately as a city with special status.

Poland, officially the Republic of Poland, is a country in Central Europe. It extends from the Baltic Sea in the north to the Sudetes and Carpathian Mountains in the south, bordered by Lithuania and Russia to the northeast, Belarus and Ukraine to the east, Slovakia and the Czech Republic to the south, and Germany to the west. The territory has a varied landscape, diverse ecosystems, and a temperate climate. Poland is composed of sixteen voivodeships and is the fifth most populous member state of the European Union (EU), with over 38 million people, and the fifth largest EU country by land area, covering 312,696 km² (120,733 sq mi). The capital and largest city is Warsaw; other major cities include Kraków, Wrocław, Łódź, Poznań, and Gdańsk.