We did block the minimum amount of rooms and have until November to add or remove rooms. Here is how my TA explained it to me. Hope this helps you. "They are applying the higher rates through night of April 23, 2012 so rates would drop night of April
24th and after. Again, these rates are based on 2011 Early Bird rates and valid only if
secured with a room block by March 25, 2011. After this date they expect to
have 2012 rates in place. Should 2012 rates be lower you group rates would
be adjusted, however, should they be higher and if a room block is not in
place, the higher rates will apply."