The Final Battle 9

No one present here will play random maps while sober. And there simply aren't 10 decent maps.

With 10 participants, you need 9 maps.
There's plenty to choose from, and the maps are quite playable, for example:
1 - 8mm6a,
2 - 6lm10a,
3 - diamond,
4 - jebus,
5 - spider,
6 - 8xm12a,
7 - 8xm8a,
8 - mini-nostalgia,
9 - 2cm4d3.

It's unlikely that any of the participants in the Facebook group are unfamiliar with these maps.

There are also some game maps left - balance l-u, nostalgia, panic, anarchy, and three m200 maps.