This request is to add an option to RSVPs that would allow the person invited to add another person to the invitation, aka PLUS ONE. The option would show both a check box and the name of the person being added. The advantage of adding the name of the person is that the event planners can make the event more personal by having things such as pre-printed name tags or seating assignments.
Thank you for sharing this feedback! This is a great description of your use case, and I am sure other site managers would like to see a similar option. I am going to add this to our enhancement requests so our development team can take look. Have a great day!