About Kupala Night
Kupala Night, also called Ivan Kupala Day, is a traditional Slavic holiday that was originally celebrated on the shortest night of the year. AS with St. John's Day, it is now celebrated on the night of June 23rd in Czech Republic, Poland and Slovakia. In Eastern Slavic countries, such as Belarus, Russia and Ukraine, it is observed according to the traditional Julian calendar on the night of July 6th.
The name of the holiday comes from a pagan fertility rite later adapted into the Orthodox Christian calendar by connecting it with St. John's Day.