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.