Because we did it last year, I see it as a possibility. There might be a case in which the provinces haven't established their break weeks, but with that type of change, with unanimous consent you can rejig it when you get closer to the date, if you wish, by one week or something. But to have to block out all those months just because of waiting for more information seems to be a little excessive.
On May 5th, 2016. See this statement in context.