Thousands of families have been left queuing in the rain for an event at the Convention Centre in Dublin before being turned away.
GamerCon is taking place today and tomorrow. However, it seem too many tickets were sold for the popular event.
It's understood 25,000 tickets were sold for the two day event but the venue can only take 7,000 people at a time.
GamerCon says it underestimated the traffic flow. It released a statement earlier today saying it would offer full refunds to those affected.
However, it has now sent a revised statement saying it has offered full refunds to those who decide not to attend and have communicated this to attendees via mobile app and all social media channels.
Many angry attendees have taken to Twitter to express their outrage.
In a statement GamerCon said it sincerely apologises for the significant delays experienced.
"As a first time event we underestimated the traffic flow that we forecast for the event and have very strict health and safety related capacities which we must adhere to. That temporarily impacted our ability to process the queue which resulted in longer than expected wait time for our attendees. We are managing this proactively and expect the situation to ease as the day progresses.
"We have offered full refunds to those who decide not to attend and have communicated this to attendees via mobile app and all social media channels."
Rohn McDonnell, from Clonsilla in west Dublin, waited almost three hours in the VIP queue after spending €120 on a VIP ticket.
He told 98FM News, "Anybody that was here today that hadn't VIP tickets queued for three and a half hours to be told when they got to the door that there wasn't room in the venue for them and they were turned away.
"There was kids crying at the door this morning ... and it was raining too, so the weather didn't help."