Nothing is known about this location before the apocalypse aside that this was a high school. Furthermore, right before the apocalypse they were hosting a fair.
During the on set of the apocalypse, the school was used as a safe zone by the military. However; due to walkers, other survivors, or both, the school quickly fell and was overrun with the undead. It appears to have become a battlefield, but if it was between two human factions, they were likely both wiped out as no one attempted to take the weapons left behind.
Michonne spots a deer in the woods and quietly grabs a gun from the van. Rick wakes up and joins Michonne. They search for the deer but it's gone. Then, they notice something else in the distance.
Rick and Michonne discover an abandoned school with a chain link fence surrounding its perimeter. They bang on the fence, and the sound attracts a walker in combat uniform with a gun slung on its shoulder.
After dispatching the walker, Michonne removes its gun. "Something serious happened here," she says. Rick inspects the shell casings on the ground and guesses they are about to find some "serious guns."
Rick and Michonne climb onto the waterlogged roof of the school for a better vantage point. They find the grounds decked out with carnival rides and swarming with walkers — all equipped with guns. Michonne describes the site as a battlefield. "I think this is it," says Rick.
As they take in the scene, Rick wonders if they'll be able to take out all the walkers. In response, Michonne fires her rifle at a gaming booth in the distance, hitting its target. They both laugh.
Suddenly, the roof below them caves in and they fall through.
Rick and Michonne land on a bed, and burst out laughing at their immense luck. As they examine their surroundings, Rick sees a large pile of boxes, each filled with canned goods and other supplies.
Rick and Michonne open the crates and discover an abundance of non-perishable food rations. That night, they feast inside the school gymnasium. They decide to set aside one third of the food for the Saviors, and a portion of the weapons for the Scavengers. As they talk about the impending war, Michonne urges Rick to lead the communities after they defeat Negan. Rick suggests they take another day or two before heading back home.
Later, Rick sits awake at night while Michonne sleeps.
Outside the school, Rick and Michonne formulate a plan to close a gap in the perimeter fence and kill all the walkers. Rick shifts an abandoned car into neutral and they roll it toward the gap. The brakes fail. A walker with an automatic rifle slung across its shoulders gets caught in some rebar; the trigger of the gun is caught in the metal, causing it to fire at Rick and Michonne. Michonne jumps into the trunk as the car rolls through the gap and comes to a stop. Walkers swarm the car.
Rick and Michonne escape the car through the sunroof and the walkers follow.
Rick and Michonne split up in order to divide the herd. While fighting walkers, Rick spots a deer and climbs the Ferris wheel to get a good shot at it. The dilapidated structure can't bear his weight and he falls. He shoots at walkers as they start to close in on him.
Michonne runs over to help Rick and sees walkers feasting on fresh flesh and intestines. She drops her katana in shock, thinking Rick has died. As walkers move toward her, Rick bursts forth from a part of the carnival ride and starts taking down walkers. He throws Michonne her katana, and she snaps back into action. After they've killed the entire herd, they hug.
As Rick and Michonne gather guns from the school grounds, he sees her crying in the distance.