I am aware of a few stage/roof failures which have never reached the press. A few years ago we were replaced by a client in favour of a cheaper stage and roof. We still had other structures etc on the site, and built the FOH 40m in front of the main stage - which was not even on site when we arrived. Sign offs done, site left, job done. I received a panic call the day before gates opened - the clients preferred suppliers' roof had failed. It was only at lx rig height, and only carrying truss, when some of the main chords broke. We managed to prep, deliver and build a stage and roof system by the next morning. This endeavour involved several drivers, 2 shifts of crew, couriers bringing spares from other event sites, and a whole lot of hard work. But we saved their event. Skip forward a few years, and the same client has made the same decision to go elsewhere. The cavalry will not be riding if anything untowards happens this time.