Like I posted elsewhere...
I'd be more worried about catastrophic structural roof failure... if small pieces get blown off here and there... that's rain and wind insize... if the whole thing structurally fails...... You wind up with large debris reigning down on the interior.... and with all those people in there.. the death toll would be massive.
ABC reporting that power has failed at the SuperDome and they have switched to generator - which is powering the lights but not the AC system.