This is great. The way they combine tradition and a good party. In Serbia we also party all day for the last day of school. People from the same class all get matching t-shirts with class mark on it like IV-1 (fourth grade of high school/gymnasium with index 1) and usually some internal joke is printed on the shirt as well. Fun starts in the early morning, musicians playing kafana music and brass bands are also common. I remember we started at 7am and it went on till 11 pm with minor breaks in the afternoon.