I was on two Carnival cruises recently - Fascination and Triumph (similar to Valor). Both had FOD meetings scheduled in piano bar during otherwise scheduled Sing-A-Longs. This is really a poor venue as it is very loud and drunken str8 people dominate the room.
I would strongly suggest meeting in Alfred's Bar, where an intimate live jazz combo performs. The equivalent on Triumph (Oxford Bar) was very warm, spacious, with nice soothing music and yet not dead in terms of passengers.