If Norm's contract is only 6 months, he'll be leaving around November 9th or 16th based on when he started. If he's extended past that, nobody's said yet. I thought Mary Michael Patterson was currently doing Mondays and Saturday matinees, which Telecharge seems to verify on the Phantom page.
I heard that Norm is leaving in October but i'm not completely sure about that! And Sierra performs Tuesday-Friday, and Mary Michael performs Saturdays and Mondays.