The Calendar facility is getting used exclusively by the Belgians. Fair play to them but the rest of us need to do better!
You'll have seen this feature in the menu at the top of the page (see pic attached). If you have a cruise planned and dates chosen, why not add it to the Calendar? It may help with planning and avoid scheduling conflicts in some cases.
I've taken the liberty of adding Easdale but I'll leave the rest up to the organisers.