If the church is being used as a rented building then the location of a concert shouldn't be a problem for anyone. But those of you who might have a problem with a particular church might want to find out if the profits from the concert would be used to promote programs that you might disagree with in principle. If you don't want the money from your ticket promoting a food bank that feeds the poor - that's your decision. Same goes if your concert ticket would help promote demonstrations of a political nature that you would not normally have anything to do with. So it sounds like a little bit of investigation would be in order.