When on the third of October the Spanish siege of Leiden was finally defeated, people of the city were nearly starving. Therefore, nowadays when the city celebrates the happy victory, herring and white bread are publicly distributed. A special traditional dish that one has to eat during the day is called the hutspot. This is basically a warm stew that will keep you full during the whole celebration!
Moreover, since the pirate-like gang of Sea Beggars helped to end the siege, people dress up as pirates and march around the streets. There are also plenty of fun activities organized, including fireworks and different performances.