I agree that the Nocturne is a good crowd pleaser, but so is Campanella.
I do not agree that one has to "understand the greatness of Rach, Liszt or Beethoven" to enjoy them. All the works are relatively accessible so should be enjoyed by pretty much anyone turning up (if played well). The idea that you have to be a pianist, music scholar or have otherwise read up on them is frankly nonsense.
Which was not what I meant at all, just tried to be brief and obviously failed to make myself understood.
If I could not sit through that program, then I assume many people who are not into these composers would also. One really needs a break between two full Beethoven sonatas, a Rach prelude that is not one of his more accessible ones and la Campanella which you either like or not, but if not is quite annoying.
I disagree about the accessibility by anyone turning up. And I am probably much closer to that "anyone" turning up than most of the people on this forum
EDIT:
Of course it also depends on whether the purpose of the event is to make the audience feel good or to showcase the ability of the performer. In the former case Chopin is a safer choice, since it's rare to find someone who cannot enjoy a Nocturne to at least some level.