Always have a list of things to check out when you arrive at the theater. Be sure to test the floor you'll be dancing on to see if it is slippery or sticky, sprung or not. Also try locating points to spot during turns so that you won't be flustered by the space. Make sure you know where your entrances and exists should be made, and how to make a cross over if you have one. And become familiar with all costumes, props and set pieces.
Teamwork is very crucial to dance.
Your awesome work will help the dancers and tech people you are working with and that's the most important part of rehearsals and performances.