If you are a past passenger of HAL, you are entitled to partake of the embarkation luncheon in the main dining room. However, that being said, we arrived at 1:25 PM and the dining closed at 1PM. Throughout our cruise, the MDR was only open from 12-1PM.
This schedule was on the Zuiderdam on Nov. 3-13, 2010. So, we wound up in the Lido which was the usual chaotic situation. However, we found a table and then went about finding something to eat. Not too bad.