Pick a couple of people who really suit your interests or curiosity, or who aligns with your own values.
Try to not pick obvious names whether they be very prominent “celebrities” or people who are very closely linked to law - you are not going to stand out from the crowd if you say Baroness Hale or Barack Obama.
Try to find something a little more unique you can do the “convince us” part of this question.
I would also try to make clear how you are defining why they would be the best dinner guests. Different people will have different views on what makes a good dinner guest, and so by making this clear you are likely to be more persuasive.