Royal Caribbean host a party on board called a 'Meet and Mingle' You register via cruisecritic.com (click on the Boards link at the top) to join the rollcall and from there you can also sign up for the Meet and Mingle.
Island cruises do welcome back cocktail patry where you get to meet fellow guest and officers mingle with you you get drinks and some food waiters come round with it also they tell you any info thats going to happen thats how we found out in 2005 that the star was coming to sea she is lovley big shi.
BTW, There are Roll Calls for all cruise lines via that same site, it is not just limited to RCI.
Royal Caribbean - Ovation of the Seas - 08 Mar 18 - 33nts
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P&O Cruises - Oceana - 20 Nov 17 - 9nts
Southampton : La Coruna (Spain) : Seville (Cadiz) : Gibraltar : Lisbon : Southapton
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MSC Cruises - MSC Preziosa - 27 Sep 17 - 7nts
Southampton : Bruges : Amsterdam : Hamburg : Paris (Le Havre) : Southampton
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