There's really no way to tell - you will have to adjust it right when the show starts, then put it away. If you're in seats, it shouldn't be too hard to take a quick look at it. Most folks will think its your cell phone.
The one piece of advice, learning from my first tape with my R09 tonight, is know where your buttons are at...I forgot which side the input level buttons were on and found myself fumbling with it in the dark trying to get the levels down. If you can adjust and place on hold when all set with minimal glances at the screen to check the levels, you'll be golden!
Good luck!