just tell the actors, I don't need to know
I currently work with a director who seems to live by this one. He tell the actors about line changes, costume changes, blocking changes, etc, but not me. About once a week, I find myself staring at the monitor, cursing, saying, "What the hell is X doing out there?"
Add to the list of things you'll never hear a stage manager say:
"I don't know and I don't care."
"I'm slipping out early, the actors can lock up."
"Sure, you can bring your two-year old to rehearsal!"