America. From FUSE TV:

Chambers, 73, was performing at the Hayward Russell City Blues Festival in Hayward, California, when a 43-year-old woman, identified by police as Dinalynn Andrews Potter, jumped onstage and knocked Chambers down. Chambers’ wife, Lola, told the Mercury News that the singer had just dedicated Curtis Mayfield and the Impressions’ “People Get Ready” to Martin, saying that if Mayfield were alive today, he’d change the lyrics from “there’s a train a comin'” to “there’s a change a comin’.”

Andrews Potter was wrestled to the ground and subdued by stage hands, and Chambers was wheeled away to an ambulance. As the video shows, he was still in good spirits, even flashing a peace sign. Chambers was treated at the hospital and released. A photo posted to Facebook by his son, Dylan, shows Chambers’ injuries: a “bruised rib muscle and nerve damage and he is sore all over,” wrote Dylan.

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