What is "russefeiring"

The russefeiring is a traditional celebration for Norwegian high school students in their final spring semester. Students that take part in the celebrations are known as russ. The russefeiring traditionally starts on around 20 April and ends on 17 May, the Norwegian Constitution day. Participants wear coloured overalls, they make groups and name a bus, car or van and celebrate almost continually during this period. Students who buy a bus, are partying in this bus the entire night until school every day from the start to 17 May. Drunkenness and public disturbances are regularly linked to the celebration.