EP or Croker? A few minor differences...

(Relax: I used the term ‘the Electric Picnic music and arts festival in Laois’ deliberately, in order to convey my lack of cool. Not that anyone ever thought, etc). Your correspondent has been in the press room in Croke Park and heard people lament the fact that the two events are on at the same time, but such keening doesn’t take their fundamental differences into account.
If you find yourself at either of these events and are unsure — for whatever chemico-pharmaceutical reasons — which one it is, here’s a handy guide to distinguish between them.