On February 2, 1968, Electric Factory Concerts (EFC) held its first concert staging, the Quaker City Rock Festival, which was hosted at a secondary location called The Spectrum (arena), because the event was too large for the Factory to occupy concert-goers. The event featured several artists such as Vanilla Fudge, Buddy Guy, and The Chambers Brothers. It survived the closing of the original Electric Factory venue and went on to prosper at a different Philadelphia location.Biography News, Volume 2. Gale Research Company, 1975, p. 153. It became prominent in promoting concerts at all venues in the Philadelphia area, including many at the Philadelphia Spectrum.
