I only would link that to the previous comment that was made about a minister being able to come more or less at the last minute, so the longer the notice is, the more likely it is that you'll be caught in a situation where there is uncertainty in terms of who is going to be participating. You have to look at the two issues together, and if you want to be strict about making sure that all the events are caught, then you'll have to consider what is a reasonable timeline. I won't draw a line for that for the committee.
On October 3rd, 2017. See this statement in context.