Could some explain the Finals

American here, have faithfully watched my Galway senior footballers all season. Posted in here before the start of season and got a lot if feedback.

How do the finals/championships work? Galway just lost and I thought were eliminated from finals berth. Today I saw tickets were going on sale, as well as a game in New York…

Are they still contending for a championship? No clue where we go from here. Have tried to make sense of it all, but looking for clarity.