Everywhere you looked, you saw people in tie-dyed t-shirts. Mothers gave drinks of apple juice to their children, while men in gray pigtails sipped Budweiser and tossed the empties beneath somebody's car. Teenagers spread blankets on the asphalt and took naps in the summer sunshine. Middle-aged hippies danced freely throughout the Philadelphia parking lot. Hundreds of mourners spontaneously gathered outside the Spectrum to bid goodbye to rock guitarist Jerry Garcia. Whenever Jerry Garcia and the Grateful Dead came trucking into Philadelphia, the Spectrum was their preferred arena for concerts. They played some fifty concerts at the Spectrum. So it was a natural site for fans to gather when Garcia died of a heart attack in a California drug treatment facility. His music had gathered differe…