“Miscellaneous § Celebrity Masquerade Game”, Gwern2009-08-05 (similar)⁠:

Misc thoughts, memories, proto-essays, musings, etc.

Proposal for a costume party game which involves social deduction of a well-known guest.

Several players start off masked, and the rest must attempt to guess which is actually the guest; each time they guess, right or wrong, they become a masked player too. Players compete to correctly guess who is the well-known guest, and then to fool as many of the remaining non-masked players as well.

When all players are masked, the game ends, and the well-known guest is revealed. Prizes are awarded for the best players at both sides of the game.