The Wianki Festival in Krakow is an annual celebration of the summer solstice. It is a traditional Polish festival that has been celebrated for centuries. The festival features traditional folk music, dancing, and food. There are also traditional crafts, such as wreaths and garlands
From Wikipedia
Wianki is a cyclical cultural event, taking place annually in Kraków at the bend of Wisła river, near the Wawel hill.