I remember one Memorial back in the 1970s when a JW brought her study. The study was an older lady, who must have thought that the JW Memorial was like Communion in some mainline Protestant Churches, open to everyone. I was one of the attendants who took the tray with the Matzos. When I brought the tray to this JW and her study, the study reached out to get a piece of the Matzo. But as she reached out, the JW grabbed her hand, preventing the study from taking what she must have thought was Communion. I don't know how the JW explained her actions to the study, but the study wasn't at the Memorial the next year.
At another Memorial a JW brought this elderly lady, who was probably her study. Anyway the JW allowed the lady to partake. But what was funny was when they passed the wine, the lady drank all the wine in the glass. The embarrassed attendant had to return the glass and tray for a refill. No doubt the lady needed the extra wine to endure the service.