By nothing different, you mean tripling/quadrupling/whatever the normal student population there in a bar area that has always been 21, therefore meaning fewer and smaller bars that can't hold that influx of people? What campus has such a large influx of people like this?
Every campus has events, many much, much larger than VEISHEA - including places with much more expressive student bodies and you don't see them going rambo in the middle of the night. Think about all the places that have incredibly large sporting events like college football and those rarely spill out into riots, and if so, it's typically a one-time thing, not a trend over several decades.