Kashubian Unity Day is observed in Poland every March 19, celebrating the Kashubians, a West Slavic ethnic group located in north-central Poland along the Baltic Sea. This annual festival has taken place since 2005, marking the anniversary of the first historical mention of Kashubians in a papal bull from 1238. The event is coordinated by the Kashubian-Pomeranian association based in Gdańsk and focuses on promoting Kashubian culture through various activities. Celebrations typically include exhibitions, folk art fairs, and a tournament of Baszka, a traditional card game invented by the Kashubians. Each year, the event is hosted in a different location within Kashubia, having previously been held in cities such as Gdańsk, Tuchomie, and Kartuzy.