Of course, I anticipate some degree of flexibility, but it may be that a key witness we would wish to have says, “Look, I can appear with you only after November 28.” Rather than waiting until November 28 and then asking, “Are you ready now?”, we could predictably say, okay, let's book you for November 29, or whatever.
Let's have some give and take in this, but the greater the line of sight, the better.