It used to be where the top 16 seeds would host on campus, not sure if that's still the case.
EDIT: Some quick research says they preselect the host sites before the season, all college venues.
http://espn.go.com/espn/story/_/id/10576298/ohio-high-schools-share-ice-hockey-state-title-7-overs
This reminded me of Red River-Central in '77. How many overtimes did that go?
Is that the one where we'd study the neighboring school's forum diligently, quickly mouse click back here and opine with seemingly witty comments, with quotes and a full report?