>>At one Latin Mass I used to attend, there were often a number of walk-ins who did not realize it was a Latin Mass.>>
Unless you’re deaf, I don’t see how one wouldn’t know it was a Latin Mass by the time communion rolls around. This man was most likely trying to cause a ruckus because of opposition to the Church or the Latin Mass. Of course, there’s the very slight possibility that he’s without an agenda and simply mentally disturbed.
I'm talking about people (mostly tourists) who were looking to attend Mass, saw a Mass time posted and showed up. They hear the opening hymn sung in English, they participate, and then the Latin Rite begins and they stay, because they want to fulfill their obligation and do not want to leave to search out another Mass.