Sansa wakes up and Tyrion is not there, natch. Probably he's off eating bread in the kitchen /rolleyes. Shae turns up and helps give Sansa a bath, managing not to give her any insolent looks this time. Sansa tells Tyrion to get changed, since he looks so dishevelled.
It is Joffrey's wedding day, so they go to have breakfast with him. Tyrion gives him a book. Tywin gives him a sword. Joff chops the book in half with the sword. Yes, Joff is still a dick. Tyrion offers to give Joff a dagger with a dragonbone hilt instead (you know, the kind that someone used to try to murder Bran back when he was in a coma after he was pushed off the tower by Jaime). Joff seems startled by this, but tries to hide the fact that he is startled. So Joff knows who tried to kill Bran but doesn't want others present to know that he knows. It's not Sansa he's keeping things from, though, he seems more than happy to torment her.
They leave for the wedding and have a chat to Prince Oberyn of Dorne (who is likely to cause some trouble at the wedding). There is some discussion of how good a king Viserys Targaryen was (not Dany's brother, some old Targaryen king). I'm not sure how significant this is, but Tyrion seems to think Viserys was a decent chap. Oberyn does not conceal his contempt for Joffrey; neither does Tyrion.
Tyrion asks Sansa some questions that confuse her. I think he's trying to figure out how much she knows about the various attempted murders of Bran. We know Tyrion feels pretty bad about the Lannisters being responsible for the deaths of her entire family. Sansa seems a bit slow figuring out that Tyrion is more on her side than other Lannisters.