I don't know if it will set off a metal detector at a concert but instead of the TZ1K, you might want to consider the TZ1S.
K means black
S means silver
Most concerts don't want professional photographers taking pictures.
They don't worry too much about amateur photographers.
According to a few people that have posted on this forum, they tend to error on the side of caution and tell their security people that large cameras and/or any black camera indicates that the photographer is a professional.
I've been having the hardest time looking for a small digital camera with huge zoom capabilities and good picture quality/price. I've settled on this one. How well is it going to take pictures at concerts? (thats all I'll use it for) Also does anyone know if it sets off metal detectors?