Ah, a thought just hit me, prompted by your post. Your question about pre-concert seems very relevant. What if, for instance, Morgan and her friends were partying in C'ville somewhere before the concert, and in fact watched the first part of the Va Tech game with a group of similarly inclined fans, before leaving to go to the concert?
At 9:30, about half an hour after the game ends, a Tech fan who watched the game, finished his beer, got into his car, and headed home coincidentally came across Morgan hitchhiking at Copeley/Ivy intersection (if he was heading west from town...the other wings place near the train station?) or on Copeley Bridge (less traveled than Ivy/250 business), and was either part of the group that was earlier enjoying the game with her group, or recognized her from there enough to be able to break the ice.
I agree that what happened before the concert may be key to what happened after, though that has been downplayed. And LE may know all of this from the friends...