I would say, using a built in mic, you can still expect to get some distortion in the recording even after taking the steps above. To reduce the distortion, you will probably want to not get too close to the speaker stacks (this is completely opposite if you have microphones that can handle extremely loud noises). Usually, the soundboard is placed somewhere where the building's acoustics will sound the best, so I would say position yourself a little in front of the soundboard (and away from security). Keep the recorder/microphone as high on your body as you can, and point it forward.
If the audience around you is very loud during songs (between songs is okay), move forward and towards one of the of the speaker stacks on the right or left of the stage - better to get some distortion in the recording from the music, than a bunch from screaming fans. However, I'm betting the audience won't be too loud for most of this show, so sticking back near the soundboard will probably get you the best results.
If you can record the entire show (using mono mode) without stopping the recorder at all, that would be awesome.
