I'm on the yearbook team (which is being run by @enaz), and Manifold has been quite a phenomenon at Proof this year. To count for this market, the market graph must be prominent enough that almost all people reading that page would be expected to see it; it can't be shrunk down and hidden somewhere. I think the best candidate is probably the Proof-in-person market (with the spike annotated), since it shows a case where Manifold has provided some genuine value in addition to fun. But a dance market or something could also work.

General policy for my markets: In the rare event of a conflict between my resolution criteria and the agreed-upon common-sense spirit of the market, I may resolve it according to the market's spirit or N/A, probably after discussion.