Nobody else in this thread so far has an interest in booking this event beyond (or seemingly during) 2015; it's regrettable that you interpret this as "nobody cares".
Nobody is saying 'live with it', either. Not sure how you're reading that. Posters are making suggestions - and, okay, guesses - what you might do or why there are problems. Nobody knows the person or persons who make decision about what special meal events to offer, when. Having written that, it seems there may be a better than average likelihood the CD manager isn't [particularly ] involved.
Yes, it's supposed to be bookable 180 days in advance, and we're now just 157 days away from February 1. I checked every day it would be offered starting January 1 - and nothing. The Tea Room has NO hours posted after 12/31/15. None. If you absolutely, positively, HAVE to know the reasoning, maybe e-mal the GF GM? Or more likely the dining manager? Or do you know anyone who would go to the GF and refuse to leave until they get a satisfactory explanation?