The annual gathering of tech leaders and entrepreneurs at Web Summit in Lisbon has taken a strange turn, with a Twitter row over hand-knitted jumpers.
The €850 (£720) sweater is available to buy on the "swag" section of its website, along with cheaper items such as T-shirts and reusable water bottles.
Some delegates and commentators took to Twitter to complain about the price.
But Web Summit chief executive Paddy Cosgrave told BBC News that, despite the outrage, the jumpers had sold out.
Genuinely concerned that this isn't a joke. Imagine a Founder pitching for seed funds to meet payroll....while wearing a €850 hand woven sweater.— Howard Watt (@VanWatt) November 2, 2019
This just underscores how tech conferences like this are for the rich and are exclusionary to founders without easy access to liquid capital. This is a symptom of a larger issue.— Allie Lindo (@AllieLindo) November 4, 2019
Web Summit, an annual technology which kicks off this week, is charging hundreds of euros for its clothing. A Handknit sweater is €850 and a jumper is €780.— Michael Stothard (@MStothard) November 4, 2019
People are confused. “Genuinely concerned that this isn’t a joke,” said one VC.https://t.co/fZ8oQRto9F
I see the web summit have finally jumper the shark.— Ciarán Walsh (@kowalshki) November 3, 2019
"It takes more than 40 hours to make these Aran sweaters so there's only about 12 in total and they are all sold," Mr Cosgrave said.
A slightly cheaper version - at 780 euros - has also sold out, according to the website, which no longer shows the prices of the items.
The back story to the sweater is that Mr Cosgrave has worn one on stage for years, knitted by his wife. Some speakers - including skateboarder Tony Hawk - had admired it and asked for one.
"If you want fast fashion from some part of the world made under very dubious circumstances, you can absolutely have a cheap sweater but if you want to support a dying indigenous industry and some wonderful female knitters in Donegal, there's a sweater I've been wearing for a number of years and we made it available online," Mr Cosgrave said.
But he acknowledged merchandise at a technology conference might be unusual. "Maybe the World Economics Forum doesn't have a merch store," he said.
When Web Summit was conceived, Mr Cosgrave and his organisers had had more experience of attending rock concerts than technology conferences.
"We wanted to fuse the excitement of a summer music festival with a more traditional business conference," he said.
And the summit was still described by some of those early visitors as "Glastonbury for geeks".
Now hosted in Lisbon's Altice Arena, more normally a venue for entertainers such as Justin Bieber and Lady Gaga, it still has the air of a festival, with delegates issued with wristbands and popcorn available for sessions on the main stage.
Back in 2010, Web Summit was a tiny gathering of "only Irish people in Dublin", Mr Cosgrave said.
"It wasn't until 2012 that our first overseas delegates started showing up," he added.
Now, the conference has grown to 70,000 delegates with some high-profile speakers. This year, former Prime Minister Tony Blair, EU negotiator Michel Barnier and European Commissioner for Competition Margrethe Vestager are speaking.
In addition, from the technology world, Boston Dynamics's Marc Raibert, Microsoft president Brad Smith and Huawei chairman Guo Ping are all on stage.