I personally feel the ban is illegal since VA has preemption and VT (or any state school) is a government institution. Granted, VT is a quasi-independent but they fall within the framework of the VA State Department of Education.
There are no ABC issues as no alcoholic beverages are allowed or served in the stadium.
When I attended the VT homecoming game two years ago, there was not any real security checks. If memory serves, there were no metal detectors and only cursory bag checks. Unless things have changed, you should be able to CC without detection.
I definitely wouldn't want to OC unless you want to be a test case and miss your game. Also, depending on your tickets and where you park, you could have a very long walk to store your firearm in your vehicle. I parked at the commuter lot off Prices Fork and walked to/from the stadium. Granted, I lived in upper quad when I attended in the early 90's and had classes in Cassell and Litton-Reeves so I was familiar with the distance and terrain.
The VT Police HQ is close to the stadium but I'm unsure how they would handle a request to store a firearm during the game.