The real question i haven't seen asked yet is, where is the moisture coming from that's rusting those bars?
The thing about the moisture is that a leak may have already fully/partially saturated any insulation on the roof. Even if you see no ponding, it will still be getting through the tar and felt and sitting on the slab like a wet sponge. And it will remain wet even when there is no indication of moisture on the roofs surface. The only non-destructive way I've ever seen to find this condition is an infra-red survey. The moist areas show up cold on the images. The more destructive way is to cut a hole in the roof and get in there and see what's going on.
<Tongue in cheek>
You could always place notices up around the stage area " Falling rocks, enter at own risk"
</Tongue in cheek>
Seriously, if it was my workplace I would have barriers up already and no performance would be on the stage until there was a green light given by a structural engineers report.
Safety first !!!
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