In the weeks before Election Day, a loose-knit group of women are organizing online to blanket their communities with pro-Kamala Harris messages — not on yard signs or fliers, but on sticky notes.

The idea is simple: Take a pad of sticky notes, write messages and post them wherever women may see them — bathroom stalls, the backs of tampon boxes, bathroom mirrors, the gym.

The messages vary slightly, but a typical one reads something like: “Woman to woman: No one sees your vote at the…