There's a conference room on two deck aft?
I had the same initial reaction! Let me see whether I can locate it.
There are three lobbies on Two Deck -- the one in front of the Computer Learning Centre, The Midships Lobby, and the other one further aft that sees much less action. I have seen table tennis being played there at times, I have seen some rehearsals for performances, some dance practice, and most recently, the money changing machine.
https://www.flickr.com/photos/prondis_in_kenya/2702720803/
On either side off this lobby, there are rooms not normally accessible to the public. The one on the port side used to be the doctor's surgery (now moved down to the hospital area), which last year was used to record onboard TV interviews... which I never watched... so I never saw what the room looked like... This was a view of the carpet and matching glass pane while a TV interview was being recorded inside :
https://www.flickr.com/photos/prondis_in_kenya/3108180489/
But I never saw anything going on in the one on the starboard side. Presumably one, or both, were the conference rooms?