From what I could find, visiting fans are usually sat in Sections 1-2 and then 31-32 if there are enough of them at Duke games:
And based on some pictures online, it seems if there are a lot of visiting fans, they then fill up Sections 3-9 or so (10 is where the student section starts) - as seen in this picture below, where Clemson fans really invade the place:
In other words, they have a true "visitors side" like Northwestern, haha. With that in mind, and as was posted on the home page, this is the current ticket availability by section for tomorrow's game...
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FYI, the gray areas are for students, so no "normal" sections have sold out. 8 sections on the "Duke side" have "Medium" or above availability, compared to zero on the "visitors side." When you click on a section and get to see the little green dots (shoutout
@IlliniInBuckeyeState), Section 1 (the most Illini-filled section) is pretty much sold out, and 2-4 look like they'll be decently full. TONS of availability on the other side, comparatively.
Getting my hopes up for a mini Illini fan invasion!!