Kupala Night (Poland, Russia, Belarus and 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".

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.

Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia. It is the largest country in the world, and extends across eleven time zones, sharing land borders with fourteen countries. With over 140 million people, Russia is the most populous country in Europe and the ninth-most populous in the world. It is a highly urbanised country, with sixteen of its urban areas having more than 1 million inhabitants. Moscow, the most populous metropolitan area in Europe, is the capital and largest city of Russia, while Saint Petersburg is its second-largest city and cultural centre.