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Abbott Elementary is deemed a Philadelphia historical landmark, much to Ava and Janine's delight; the school plans a celebration in honor of its namesake, but not everything goes as planned.
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.
Janine spearheads a pilot program that brings a librarian to Abbott; Melissa and Jacob deal with some big changes at home.