Tipperary will take on Kerry in the Minor Football Final shortly (1.15pm) while Dublin face Kerry in the Senior decider (3.30pm).
With Croke Park tickets impossible to come by at this late stage, GAA fans are being invited to an outdoor screening of the finals at the Smithfield Plaza in Dublin today.
People are being advised to use public transport as there will be no special parking arrangement for the event.
Alan Breen from Dublin City Council said: "From 1pm to 6pm it will be a great family event with bouncy castles, costume characters and face-painting."
Access to Smithfield Plaza will be strictly by the new Church Street entrance to the south east of the square.