What is the name of a joint meal during which the invitees serve themselves?

Dan, It doesn’t say that in the notes , but I think you do have to stand to serve yourself . I also normally sit to eat once I have collected my food

You can sit at buffet style restaurants....

I didn't realize I needed to stand at a buffet. I have always sat down to eat.

I don't like the buffet

,,,) 000 plop lpp

why is the word 'joint' in the question?