@Jeffatron first up - welcome to the World Prediction Championship!!!
As we're treating this as just one PPV (which is what AEW are essentially doing) the deadline for night two is showtime on night one.
Everybody that predicts get's into the rankings so you'll be in there - assuming DOMINION is a nine match card you can still reach the 20 predictions limit and then it's just down to actually doing well to get into the tournament.
In theory 20 decent predictions could put somebody right to the top of the rankings....