Oct. 13 & 27. All invited to join an evening of this early American form of hymn singing that uses musical notation with distinct shapes to make learning easier. Also, on Oct. 3, the “1st Annual Ypsi-Arbor All Day Sing” (10 a.m.–3 p.m.) includes songs from The Sacred Harp (2025 edition) and a potluck (see website for sign-up). Songbooks available. No experience required. 7–9 p.m., Riverside Arts Center, Off Center Bldg., 76 N. Huron St., Ypsi. Free. (734) 480–2787, riversidearts.org/shape-note-singing-ypsilanti.