Nothing. Just like Tyrion, Dany, Brienne....
That's why I don't know if I'll bother with the book when it finally does come out. It's been years, I don't remember much and what I do remember could just be the show at this point.
Tyrion showed up to Mereen, but Dany is stranded. Brienne was bitten by some zombie? I have no idea what's going on at King's Landing. Stannis is presumed lost, but maybe not? I can't remember if the white walkers got him or Bolton. What else? Arya is blind in Braavos or something. Jon is waiting to be resurrected.
Tyrion recruited the Second Sons to join Daenerys in Westeros.
Daenerys had a miscarriage and stumbled into Khal Jhaqo's khalasar with Drogon.
Brienne is leading Jaime to meet and probably be executed by the resurrected Catelyn Stark.
Stannis is outside Winterfell with Asha, Theon, and a bunch of Karstarks who are planning to betray him.
Arya was unblinded, killed a guy, and has been raised to a journeyman of sorts.
There is so much going on at the end of ADWD and I can't really blame anyone who forgets what happened. Shit was six years.