Dany spends the final nights before her wedding to whats-his-name with Daario. I suppose she might as well have some fun.
Quentyn Martell has arrived. Dany holds court to meet him. It turns out there was a pact signed years ago that Viserys should marry one of Doran Martell's daughters and join forces and defeat the usurper Robert Baratheon and put a Targaryen back on the iron throne. With Viserys dead, the marriage can be between Dany and Quentyn and Dany instead.
The only slight snag is she is marrying what's-his-name in the morning. So Dany says, maybe one day, if I don't die in the meantime from Yunkish invaders or old age.
She goes through with it, too, despite wishing Daario would sweep her away like Rhaegar did Lyana (which I think caused a lot of the usurper trouble, although there's a small aside about Mad King Aerys pissing off Tywin by groping his wife at their wedding, which also won't have helped. And we know what else he got up to, that guy really did have an usurping coming).
The wedding was all straightforward. So I presume we will shortly find out what the trouble with what's-his-name is. How he plans to keep the peace really. What sort of an awful husband he will be. Presumably whatever it is will finally persuade Dany to abandon Meereen for Westeros.
Hizbahr. That's his name.