Can someone explain what are these Tian and wig 'events' I keep hearing about?

I'm on my third play-through and still haven't seen/heard anything of the sort... Just for completion's sake, I'd hate to miss something so obvious when taking my sweet time trying to explore every nook and cranny of the game.

Lol definately one of those "in plain sight" things. When you hit NG+ Wil has an always active star event in the workshop that has you select a number of "headgear" for the very bald Tian. You can only get to this event if you clear the Tutorial event that is active on Wil at the beginning of every new game.