It's only a show.
Everything in theatre ultimately feeds into a given performance of a given show. If one of those shows is imperfect, oh well: it's not the end of the world. If one of those shows is cancelled, oh well: it's one of thousands, there will be other opportunities. No matter how stressful it becomes, it's still only a show, and the planet will continue revolving even if it doesn't go perfectly according to plan.
And, of course, if things become dangerous, remember: it's only a show. No performance is worth breaking your neck, or huffing asbestos, or burning the building down.