Fun fact: I've read through the entirety of the original Three Kingdoms in it's original Chinese form. Diao Chan actually plays VERY minuscule role in it , so much so that she's actually not an important character AT ALL, but rather "just yet another simple NPC" of sorts. It's Koei's games in general and ESPECIALLY Kessen series which were downright BASTARDIZING the original Three Kingdoms story SO HARD that they've changed Diao Chan into something of an "importance". In reality - she's not. At all. Not even in the slightest. Kessen tries to make it seem like Diao Chan is the main female heroine, like she's some kind of princess Zelda, or something. She's not. Not at-friggin'-all. She's an absolute "passer-by" and utterly unimportant character in the original Three Kingdoms epic. Don't be fooled by Koei. They've screwed this up.
Well, seeing that Koei based their games on the Romance of the Three Kingdoms, which was an artistically tweaked version of the original historical records...
How to get the event in RTK 2 (PC)? I peek at the exe and found some text about Diao Chan years ago (in the 90s). But couldn't get any events triggered.
Records of Three Kingdoms = { Three Kingdoms } x Wei/Jin bias x Shu bias x Historicity Romance of Three Kingdoms = { Records of Three Kingdoms } x { Three Kingdoms ancient folk tales } x { Three Kingdoms Yuan dramas } x Shu bias Koei's Three Kingdoms games = { Romance of Three Kingdoms } x modern popular culture x { Japanese bias of Yokoyama Mitsuteru Sangokushi } x Superheroes x Dramas