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So, here are the maps that someone in the thread suggested, one way or another.
P.S., Circle 2.0, Bizarro, Lezkandra, Plains of Despair 1.6, If these walls (debatable, but possible), Spleen, Will and Reason, Showdown
1 Power Spot
2 Circle 2.0
3 Bizarro
4 Lezkandra
5 Plains of Despair 1.6
6 If these walls could talk
7 Showdown
8 Spleen
9 Will and Reason
10 Dark and Dalia
11 Ruins of Zezland
12 Heart of the Winter
These maps were mentioned. I would remove 8, 10, and 11, in my opinion.
And Double Oxygen is right; for such a large scale, that would be the best option. Groups can either be scheduled in rounds, which is inconvenient with a large number of players, or rely on the honesty and integrity of the players themselves.