Tone down saturation and contrast in your camera. The dancers often wear colorful costumes and perform under bright, gelled lights. In post-processing, it’s a lot easier to add vibrancy and contrast than to remove them.
Attend rehearsal if you can, to identify key moments in the dance and to experiment with different angles. Pay attention to the rhythm of the music to better predict movement and action.
If you’re going to photograph an entire concert, know your physical limitations. Vibration reduction will not save you as you track fast-moving dancers across the stage for 2-3 hours straight. I learned the hard way that I am no longer fit enough to hand-hold the 70-200 f/2.8 for hours of continuous shooting. If there is room for a tripod, I’ll use one. If not, I’ll use a monopod.