Odds are they contract out to a production company for their stage techs, they could also contract out to IA, whatever it may be. Many venues will do this and put the burdin of getting people and paying people on the production company and the production company will get payed a lump some for the gig. Also, in the R&R biz the person you are trying to talk to is rarely ever called a
Master Electrician (its a dying term anyway...). Most of the time they are either a lighting director or head electrican. These are both seperate jobs, but sometimes combined. Also, if this is a larger venue that has shows coming through regulary, you will want to talk to the
house electrician. I would stay away from contacting the venues directly for tech work because odds are the people that you will talk to really don't have a clue as to what is going on onstage. Call the local rental houses/production companys. Even calling the local sound companys and asking "who is in charge of lighitng at such a such venue" will help. Usually the sound companys are much "localer" then the lighting companies.