Gregory is hesitant when kids start hanging out in his classroom at lunch, looking to him for advice; Barbara is shocked to find Tariq is dating the mother of one of her students; Janine and Jacob try to hire an ASL interpreter.

After a student is caught smoking, the Abbott staff come together to revamp the outdated drug policy. Meanwhile, Janine tries to prep the new substitute teacher for her class but finds it challenging to give up her former role.

When Barbara's church choir uses the gym for rehearsals, Ava notices tension in the group. Jacob's eagerness for a full social calendar worries Gregory. Melissa and Janine investigate a new substitute.

Abbott Elementary is deemed a Philadelphia historical landmark, much to Ava and Janine’s delight; however, Barbara and Melissa are not as impressed. The school plans a celebration in honor of its namesake, but not everything goes as planned.

Janine spearheads a pilot program that brings a librarian to Abbott; however, when friction arises with one of the teachers, it strains Janine's relationships with both parties. Meanwhile, both Melissa and Jacob deal with some big changes at home.

Ava and Gregory are invited to speak on a panel about public schools. Elsewhere, the other teachers must complete CPR training, and Janine faces challenges securing district approval for her librarian extension program.

Jacob is shocked when he finds out his colleagues are not invested in his frequent email messages and haven’t even been writing their own replies. Meanwhile, Gregory turns to Janine for help with a former student.

Ava Fest is back, and with the help of the teachers, Ava’s set on outdoing last year by any means necessary. After Janine accepts the offer for a full-time position at the district, she just has to check off one last thing to make it official.

Two teachers head out on a double date, but when they run into familiar bar patrons, it proves to be an unfortunate distraction. At Ava’s first book club meeting, the group ends up in a debate over who would be the best post-apocalyptic leader.

Barbara invites Gregory to her family’s Mother’s Day brunch. Jacob scrambles to figure out how to organize a school field trip.

Jacob manages to pull off a schoolwide field trip to the park; however, when Abbott must share the playground, the fun and games turn competitive. Elsewhere, Mr. Johnson enjoys having an empty school to himself.

It’s the last day of school! Ahead of summer vacation, Janine throws the perfect end-of-year party for her colleagues and friends, taking all their interests into consideration.