Northern California’s Sonoma Valley is hosting the first annual St. Regis Polo Cup, taking place at the Wild Oak Saddle Club on September 20. The polo icon Nacho Figueras will play in the Sonoma match and meet with fans. The $350 spectator entrance fee and proceeds from various charity auctions will benefit the Giant Steps Therapeutic Equestrian Center for children with disabilities.

The St. Regis San Francisco, about a 2-hour drive from the Wild Oak Saddle Club, is offering the St. Regis Polo Cup Aficionad…