Our critics pick the 20 must-see shows at the world's biggest arts festivalTheatreNOLARemember the BP oil spill in the Gulf of Mexico in 2010? Many are still living with the aftermath. Fringe First winners Look Left Look Right's verbatim play explores the disaster and its consequences. Underbelly (0844 545 8252), 2-26 August.Les Naufragés du Fol Espoir (Aurores)The International festival provides an all-too-rare opp…
