If you could run a stand I would say it will be your best bet.
Either way I would go CA Cards>Pre>R09. (I use the same set up into an iRiver).
I Set the Pre to +10, Input level max, then start with the gain on the recorder at +3 to +6. I usually try to judge levels from PA music being played before the act comes on stage. (Assuming that the performance is amped/Pa'ed). Mics DIN (ish) but whatever your preference will suffice.
If you get a stand, try to run about 6-12" above average head height, 7' is usually what I aim for, which should give you a decent clean recording, with enough crowd to maintain the atmosphere of the show.
If you can't get center and front, try standing and clipping the mics to your person at a point as high as possible, and stand still.
If you can't get anywhere central, aim the mics at a stack. Sometimes a stack tape is better than no tape at all.
Most of all enjoy the show, if you get a tape afterwards then consider it a bonus.
(I am sure more experienced people will chime in with their opinions).
Good Luck.
Dave.