Half a sports science degree and a season ticket's worth of guilt. This is the circuit I actually show up for: the big stadiums for the proper days out, the small grounds where you can hear the manager shouting, and the pubs where the real analysis happens after three pints. Field research, obviously.
Skipped a 9am for Ireland v whoever once and would do it again. The walk down Lansdowne Road beforehand is basically a fashion show for men in replica jerseys.
82,000 people and somehow still manages to feel like your local club final. The Hill on All-Ireland day is a module in crowd psychology nobody's teaching.