I remember a SPAC show in the '80's when Grateful Dead played through a storm that cut out power for seconds at a time during massive lightening and thunder. The Wheel had moments where they would lose sound but the drummers never missed a beat and the band kept playing on.
Been to many shows where I was amazed bands kept on keepin on. If the stage is sufficiently covered and grounded then only wind should be an issue.
Check out Like a Hurricane with Neil Young and Crazy Horse in rain damn near horizontal in the wind at The Gorge - the movie is Year of the Horse. Jim Jarm flick. Awesome. I was there.
So, has there ever been a lightening strike death in a crowd at a show? I've never heard of one, and I get nervous sometimes cuz I was once knocked unconscious with a buddy in the mountains.
Ain't it good to be alive?