It varies on the size of the performance...
but before every performance i go off to the side and do Ardaas on my own, and get myself into a zone...after my own personal reflection, i go ahead and make sure the team is set properly and the guys are set to go.
Before i even leave for a performance (if it's at night)...i do kirtan sohila silently in my mind and get ready for it all.
But once i'm on stage...well, i get into a zone...and i don't recognize the surroundings, and just get right into it. I also remind myself (in order to take away some nervousness), if i mess up...the world doesn't end.