For each of the past 55 years, the 400 and 500 blocks of West Mifflin Street have undergone a one-day transformation. The usually quiet stretch of vintage student rentals becomes a seething mass of humanity, a jungle that officials have tried to weed and tame, often with little success. The will of a 19-year-old business major to get plastered continues to triumph over the best-laid plans of mayors and council members.