I have super-clamped to some theater seats arms before, but it's very dependent on the particular arm. I don't think I've ever done it at the Orpheum, I don't remember specifics, I'm guessing the arms aren't the right shape for gripping.
I will frequently just bring a couple of bungee cords, some zip ties, some tape, and when I get there inevitable the McGyver skills will kick in. like Rory said, just attach a folded up stand or mono pole to the seat upright somehow.
There will be bunch of us a SCI... if you have an official taper's ticket they will have us in some crappy OTS somewhere and you can probably clamp on to one of us.