Churches Where They Were Not Members

My great-grandmother was a sponsor of her aunt's baby in 1905. The baptism took place in a church where my great-grandmother was not a member and in a town where she never lived. Had I not been working on the "entire family," I would not have located the reference. Was it crucial to my search? No. But someone's name appearing in a record means that they are alive on a certain date and there are times where that is a big clue all by itself.