The Three Brothers Days is one of the largest events in the city. This feast refers to the legend concerning the early founding of the city in 810. During the three days of the feast participants take part in cultural, sporting and recreational activities. These includes the most popular concerts of Polish and Czech stages, cabaretes, colorful costume parades, competitions, exhibitions and trade fairs. The culmination of The Three Brothers Days is fireworks night show over the Olza river.