Evacuation Orders, Saving Marlene, and The Rescue are quests in Chapter 12, "Fight for Survival", in Final Fantasy VII Remake. They take place in the Sector 7 Slums. After Cloud Strife fights in the Sector 7 Plate, Tifa Lockhart leaves to help him, while Aerith Gainsborough and Wedge return to Seventh Heaven to escort Marlene Wallace to safety.
Aerith Gainsborough becomes the party leader. Follow Wedge towards the slums for a cutscene, then head right towards Seventh Heaven to witness a cutscene. After this, continue running for another cutscene. A crashed helicopter blocks Aerith's path; run back and take the road right (leading west on the map), and then the next road right, for the path to be blocked.
When the path is blocked, following the cutscene, move towards a tunnel where other residents are running and talk to Marle to drop Betty off. Once she is dropped off, run north past the residents, then head east, when a quick explosion occurs. Following the cutscene, run towards Seventh Heaven, under the debris then head inside. Marlene is found crying under the kitchen on the right. After this, walk towards the door and leave, leading to a cutscene, following which the next quest, "To the Top", commences.