I used to play golf with a guy or two that just couldn't function golf-wise if someone within 100 yards of them was moving, scratching their balls, shifting their weight, etc. I always thought it was crazy to worry so much about things you can't control.
Try your best at the show to zone in on the music and just don't worry about what the recording will turn out like.
Ask yourself, are you there to enjoy the music or to worry about things you can't control such that someone else can ruin your experience without even realizing it or trying. Not only that, but why let the enjoyment that someone is experiencing at a show bring you down. If someone is enjoying a show that much, that can be contagious and help you enjoy the show more.
For me, it's simply not worth worrying about, so I don't. It frees me up to enjoy the experience.
Having said this, if it's a stand-up show without seating, the best advice I read here a couple years ago. If someone is standing too close to your mics, all you have to do is crowd into their personal space. Don't say anything or even look at them...while you're watching the music and dancing away...just snuggle up nice and close enough that they feel uncomfortable about standing too close. Within seconds, they'll move away. Works every time!
