The name of the holiday was originally Kupala; a pagan fertility rite later adapted into the Orthodox Christian calendar by connecting it with St. John's Day which is celebrated on 24 June.

Kupalo/Kupala is a Slavic deity representing joy, mid-summer, peace, magic, water, and herbs. Alongside his sister Kostroma, they represented fertility. Kupalo/Kupala is celebrated at a festival called Kupala Night with rituals of purification through water and fire. The name  Kupala or Kupalo is etymologically related to the verb kupati, "to wet" or "to bathe." (

This weekend, the jubilee, 20th edition of the Kupala Night takes place at the Pomeranian Dukes' Castle in Szczecin. Kupała Night - Midsummer traditions is a popular open-air event, which has been organized by the Szczecin Castle for many years in cooperation with the Triglav association.

Triglav (Polish: "Drużyna Grodu Trzygłowa") is an association dedicated to exploring and popularizing the culture of the Slavs of the early Middle Ages. It accomplishes this through the so-called "historical reenactment", i.e. action aimed at recreating selected areas of old culture, both in the material, spiritual and social dimensions. (

The Kupala Night event includes such attractions as fights of warriors, demonstrations of old rituals, concerts and fire shows.