My church has asked me to take candid photos of our congregation, which includes minors. It would be extremely difficult to have everyone sign a model release form, especially if we have visitors that are captured in one of the group shots. Also due to our size, it's going to be impossible to know who everyone is. Would a blanket statement published to all regular attenders suffice? Having never done this before for such a large group, I'm unsure of the protocol. Any help would be greatly appreciated.