There was a similar conference organiser clash a few years ago. It seems to be a start of bubble/end of bubble thing.
The TRAFFIC Dublin thing turned out to be something not even a few pints of Guinness could save. It might have been great for tourists but it was poorly attended by the locals. The .ie ccTLD has rules about domain sales and also is far more stringent in terms of what can be registered. So it was not possible to auction any .ie domains at the show. The .eu is almost unused extension here and of the supposed 50K or so "Irish" .eu domains only 10K or less are genuinely Irish owned. (Most are owned by non-EU cyberwarehousers and direct navigation operations.) In terms of usage (I'm currently building an Irish search engine index) the .eu ccTLD is just a non-core TLD in Ireland. There are more .co.uk domains registered in Ireland than either .eu or .net. In reality the Dublin TRAFFIC show seemed to be some kind of tourist event.
There's a gradual shift to ccTLDs and the TLDs on the periphery of the com/ccTLD axis are getting hit hard. Some of these conferences had made their money on .com domains but they seem to be vulnerable to lower priced competition and, ironically, the conference is a volume business.