Croke Park will see its biggest crowd of the year on Saturday with the Dublin-Mayo All-Ireland semi-final heading towards an 83,200 sell-out.
With tickets going on general sale on Tuesday morning, a day later than usual due to the August Bank Holiday, there has been a scramble in both counties.
Long queues have been reported outside SuperValu shops in both counties that are selling tickets while people using the GAA's official ticketing partner were greeted online with the news that there were virtual queues of up to 10,000 customers and more than an hour long.
The biggest crowd that Croke Park has seen this year for a sporting occasion in 2019, Westlife and the Spice Girls both sold it out for gigs this summer, was the 61,852 that attended the recent Tipperary-Wexford All-Ireland hurling semi-final.
Football crowds have again been disappointing, with the Dubs no longer a guaranteed sell-out at Headquarters as they used to be in the latter stages of the championship.
So far the biggest crowd of the year at Croke Park has been the 48,723 that attended the Mayo-Meath, Kerry-Donegal Super 8s game.
Just over 47,000 were at the Leinster final to see Dublin hammer Meath, though the numbers fell back to 36,530 for Dublin-Roscommon, which was a double-header with Tyrone-Cork, and 30,214 for Dublin-Cork.
Dublin-Mayo is one of the most intense modern rivalries in the game and since 2012 they have met in two All-Ireland semi-finals, one of which ended in a draw, and the '13, ’16 and ’17 finals, with ’16 going to a replay.