If you have others doing the actual rigging and whatnot for you, there is very little physical danger (except for the occasional angry roadie fight). If, however, you are also taking on the role of a lighting technician, you could be up on a tall ladder, bending your body backward in unnatural ways in an attempt to hang an extremely heavy spotlight. That's got danger written all over it. As much for the people passing by below you. But you've got yourself to worry about first, so who cares about them? They've probably got insurance.