This was the box office personnel understanding when I purchased tix back in December. "Don't lose your tickets between games. You will need them to reenter for the second game and again on Saturday."
With the other Thursday regional being in Fargo this sounds like a Noon/6 PM slate in Manchester. Be thankful it's highly likely that Denver/Cornell gets the Noon slot. With the day off on Friday it doesn't really matter who gets the first game but my guess is that's how it will play out here.