The congregation I was in until about two years ago, used marking talks pretty often!
My first wife had been studying for two years before we got married, and got baptised two weeks before we got married. I never told her, that I was going to be marked, and have a special talk marking me, if she wasn't baptised! I had not understood that I would be marked, because she had made it plain she was going to get baptised in the spring, but changed and did it at the end of summer!