The selection path:
boards/ categories/ cruise lines/ MSC/MSC bellissima
has no date selection. It finds 13 selections from all dates, but there is no September 20th entry.
The "Roll Calls" path does list our cruise as you say:
roll calls/ MSC roll calls/ msc Bellissima roll calls
Has a date selection, but works fine without, with our 20 September cruise at the top of the list.