Vans’ Warped Tour enters third decade By Denny Dyroff, Staff Writer, The Times  60s rock legends The Yardbirds have survived changing rosters, the departure of superstars and more, and still keep on rocking. If you’ve ever seen the movie “Monty Python and the Holy Grail,” you surely remember the Black Knight. He challenges King Arthur who then cuts off the knight’s left arm. The Black...