There’s much more to this summer’s festival scene than warm cider, soggy tents and yet another comeback tour. If you’ve ever wondered what it would be like to take part in the world’s biggest food fight, rock it out at the air guitar championships or parade through town in a coffin, this could be your lucky summer.  In fact, whatever your dream festival happens to be, the chances are it’s already been thought up and is happening somewhere on Europe’s…