KirbyCat-
Anytime I've done a show with a scrim show curtain there has always been a "blackout" curtain on the next fly line behind it. This way there can be lights on behind it for cast and crew to get set up behind it before the show, at intermission, during the show, etc.
"If this is going to be a Christian nation that doesn't help the poor, either we have to pretend that Jesus was just as selfish as we are, or we've got to acknowledge that He commanded us to love the poor and serve the needy without condition and then admit that we just don't want to do it." -Stephen Colbert