I was lucky enough to be in Gothenburg this year for the evening of the Cortège, a university carnival that takes place every Walpurgis Night (the last night of April, which is basically the calendric mirror image of Hallowe'en).
Many of the floats had a current affairs theme, often based on Swedish politics that I didn't understand at all. Others featured international events such as the Olympics, or North Korean missile tests. These were interspersed with a variety of university bands, dance troupes, and home-made vehicles (see above for one of the most impressive examples).
One of my favourite acts in the procession was a brass band which started out perfectly seriously, and soon turned into a display of physical theatre.
The university students clearly had a lot of fun putting this together, and it was a great evening's entertainment.