At the time when the University was an all-male school, there were four main social weekends: Opening in the fall, Mid-Winter in February, Easters during Easter weekend and Finals around graduation weekend.
In the 1930s and 1940s, the dances were the highlight of the weekend. Then in the 1960s, the University fraternities became more involved. At the time, drinking was considered a violation of the honor code; however, this belief died quickly as the combination of Easters and alcohol grew more popular.
From the words of Playboy: “Sorry, U.Va., we don't rate professionals.”
After the muddy weekend (it was so bad, dorm shower drains were clogged), the University tried to move the event away from Mad Bowl to another location off-Grounds but failed.