Fans of the Grateful Dead are pouring into San Francisco for three days of concerts and festivities marking the 60th anniversary of the scruffy jam band that came to embody a city where people wore flowers in their hair and made love,

When you walk out the exits of a major concert at Golden Gate Park onto 30th Avenue, usually you hear a chorus of vendors hawking steaming-hot bacon-wrapped hot dogs. But this weekend after the Dead & Company shows, the calls were something entirely different: “ice cold fatties.”