Also, by "2 weeks ahead of the event" I meant "2 weeks before any of the fight begins." If the fight has started and no one has contacted any members of Central 5 about any power-ups, then no unrevealed power ups should be occurring in that fight. I think that's fair, because you should at least know 2 weeks ahead of a fight whether a reveal should be occurring in that fight.
That time limit can be changed at any time at Central 5's choice, as well. That time frame is just a random baseline I came up with in order to get my idea across.