I was at that last year and, quite frankly, it was a rip off.
We had to pay in and then got vouchers to use to buy food and drink. The food was all in small taster size portions, which is fair enough, but they wanted anywhere from €5 to €7 worth of vouchers for each tiny little taster. We had to buy more vouchers, so we ended up spending a bloody fortune there and still had to go get food afterwards.
The Porterhouse and the Carlow brewing company both had stalls.
The Carlow Brew Co. had a small stall selling bottles of their beers in presentation boxes, while the Porterhouse had a full scale pub set up, with tables, multiple beers on tap and a fridge with a small selection of imports.