Here"s the brief from last year"s Irish event...
"Irish Championship £50+£5
Capacity 120 runners - 15k Stack - 20 Mins L1-12, 30 Mins L13+ - Ranking Points 1st-9th
Players are dealt 4 cards each and a round of pre-flop betting, Pot Limit, will take place.
Once the Flop is dealt betting will be No Limit thereafter, and AFTER the first round of No Limit betting each player will muck 2 cards each - so immediately before the Turn is dealt when Flop betting is complete.
So, betting pre-flop is Pot Limit, and post-flop is No Limit.
Players use ANY 5 cards to win a pot."
I would expect the game to be the same even if structure changes