Okay, last graduating tradition:

Each class rents a big truck, and after the graduation ceremony, they ride it through the entire city, to visit the parents of each classmate. The procedure is: get off the truck, run in, drink loads of beer and wine, eat snacks, run back to the truck after five minutes.
Since you have 28 places to go, and since the truck is also loaded with alcohol, it's the most drunken happening you can imagine.
Still, I got a few good pictures out of it.

The girl with her tongue out is the beautiful Sigrid.