If you're off on the 30th take life easy, stay at home and put your feet up because you deserve your days off.
Your can read on the portal, or even here! how little you're going to get, you really won't be missing anything at all.
It won't change things by being there, and the buffet really is no better than what your wife can knock up for lunch, as you well know in emirates, if it's free it's going to be crap!!!