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"The Last Rivet" ceremony, April 27, 1937, was the first ceremony to mark the completion of the Golden Gate Bridge. Charles Segerstrom of Sonora had cast a rivet using gold from an historic California gold mine and donated it to the Bridge District. Numerous dignitaries, including engineer, Joseph Strauss, spoke to the hundreds of people invited to the celebration. With great difficulty, the golden rivet was "driven" into the last hole. Later it was removed and replaced with a steel rivet, making the bridge structurally complete. A month later, on May 27, 1937, the opening day "Fiesta" for pedestrians was held.