I watched the season the full way through.
Rosita found a gun and kept it hidden on herself. Carl managed to sneak onto a truck belonging to the Saviors, and when they opened it, he mowed them down about three of them before they managed to subdue him. Negan took this upon himself to send more of his people to Alexandria and take more stuff.
Spencer then talks with Negan, in an effort to get Negan to kill Rick, and put him in charge. In response, Negan kills Spencer. While going off, Rosita goes to shoot Negan, and instead hits his bat, Lucille, which throws Negan into a rage. He wants to know how she got the bullet, she lies twice, and in return he has a Savior kill Gloria, the woman who watched the pantry.
Morgan and Carol are still in the Kingdom, Morgan with the general population, and Carol on the outskirts in her house.
Someone has slid Daryl the keys to his cell. he escapes and makes his way back to Alexandria.
Rick & Aaron return from hunting and find Negan in mid rant, both Gloria and Spencer dead. Negan informs him of what both Carl and Rosita did, and says more blood will be spilled if they don't turn over who made the bullet to him. Eugene confesses and is kidnapped by Negan.
Maggie stands guard at the Hilltop gate. She sees something in the distance and smiles. Rick, Michonne, Carl, Rosita, and Tara enter the Hilltop and reunite with Maggie, Sasha, and Enid. Rick admits that Maggie was right all along — they have to get ready to fight. Daryl and Jesus come out to greet them.
Scenes for next season seem to show Alexandria, The Hilltop & The Kingdom all uniting against Negan and the Saviors.