In the first two weeks of the northern construction holiday, the Sintrale Kommisie Skûtsjesilen (the Central Skûtsjesilen Committee) organizes the SKS championship: a series of 11 sailing races with skûtsjes. Skûtsjes are historical cargo ships that were built between 1900 and 1931 at one of the shipyards in Friesland. The competitions are sailed in a fixed historical order at various towns and villages in the province of Friesland. Each village and town has its own interpretation of the competition day. The participating skûtsjes sail with their follow-on fleet from village to village. Each follow-on fleet has a ship that serves as the 'mother ship', this ship plays a central role for each participating skûtsje. The skippers of the skûtsjes come from old skippers' families and are often still involved in (inland) navigation. The public, totalling some 400,000 people, can follow the races from the shore or from their own boat on the water.
The SKS races are sailed under the own SKS competition rules and the judging takes place as laid down in the SKS Handbook. In addition, the racing skûtsjes must meet the requirements as laid down in the originality regulations.
On the Friday evening before the first race, the draw for the shore start of the skûtsjes at the Feanhoop and Earnewâld is held in Grou. For this occasion, the skippers cap of Fokke Wijkstra is retrieved from the Fries Scheepvaartmuseum. The tickets are drawn from the cap. The final race is a fortnight later on the Sneekermeer Lake, after which the champion is announced. The final prize-giving will subsequently take place on the Start Island in the party tent, after which there will be a closing party.
The individual races are organized by autonomous local race committees. In addition to the general SKS Racing Rules, they also use local racing rules. These are necessary to organize the race on the specific competition water.