When I go to see contemporary dance performances, or any artwork really, I like to inform myself, read some learn something about the piece then I get the most out of the experience by engaging with the artwork corporeally rather than rationally.
Chris Boyd on his blog called The Morning After the Night Before: Performimg Arts in Australia says "We need to turn off the visual cortex. We need to see with the body. To try to apprehend rather than comprehend."
Image: Aether performed by the Lucy Guerin Company at the Sydney Festival