Unfortunately, a venue that I frequent has started using metal detectors as well. When I first saw the wands, I hesitated and thought about putting my gear in the car, but I said hell with it and just walked through. Nothing went off that time, or the two other times I was wanded. Keep in mind that it probably would go off if their wands were set to a higher sensitivity, I do get nervous about that every time. I am stealthing a Sony M1, a plastic battery box, and DPA 4061 mics.
Good luck.