I see the point that you are making Ex. P, but most of the last 16 fixtures will be known ahead of those games actually being played. Only the last few teams involved will be decided on the 25th. Any of the dedicated participants in the competition should have enough advance time to make most of their predictions and then submit them ahead of the deadline.
I'm a bit unclear as to some of your rules. Are we being asked to predict both the result and the actual score line or only the result?