... if I willingly walk into a church am not I giving tacit approval to that church's activities? bob

If you take a tour of the White House are you supporting the policies of the President? The real question I would have to ask myself is where are the proceeds of the concert going? If it's in the performers and promoters pockets it's one thing. If the proceeds go toward supporting the programs and activities of the church involved that's something else alltogether. IF those activites upset you. My old church had regular concerts that supported a non-denominational food bank.