Observer Editor, Free
Event Derby Horse Show: Cobblestone Farms at Revel Run.
Horses and riders compete in dressage, cross-country riding, and stadium jumping. Concessions. 9 a.m.–4 p.m., Revel Run, 555 S. Dancer Rd., Chelsea. Free. cobblestonefarmsllc.com, secretary@cobblestonefarmsllc.com.
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