Stereophonics fans have expressed outrage at having to queue to exchange their tickets for wristbands at the gig in Wrexham this weekend.
More than 20,000 people are expected to descend on the Glyndwr University Racecourse Stadium for this Saturday's concert.
But all of them will have to swap their tickets for wristbands first.
They can do so in advance of the gig, but revellers are only able to collect their own wristband - they can’t pick any up for any other people in their party.
Fans can go to the Sports Centre on the grounds of Wrexham University behind the stadium on Friday from 5pm until 9pm or Saturday from 1pm until 10pm.
Those planning to attend the first gig of its kind in 30 years at the venue have spoken of their anger pre-empting chaos on the day.
On Facebook, one fan said: “It’s going to be a nightmare, really poor organisation.”
Another said: “Why is a ticket not good enough?”
One woman wrote: “I can just foresee mass queues. At least they’re giving out wristbands until 10pm hey?”
And a man posted: “1pm on Saturday is laughable, open doors at 9am for wristbands.”
Another added: “Driving down from Glasgow on Saturday morning so going to spend my afternoon queuing for a wristband instead of having a few beers with friends, which is if truth be told, one of the main reasons I’m coming all that way.”
One fan said: “I am really considering selling my tickets to avoid what is going to be a massive disaster.”
But one woman wrote: “Let’s not moan. Too much of that going on at the mo. Let’s just collect wristbands and enjoy a local event and hope it’s the start of many more.”
Organisers say wristbands need to be locked onto each individual person’s wrist to prevent them getting lost or stolen and as a measure against fraud and ticket touting.
They explained the reason why people have to have a wristband if they already have a ticket.
“Customers from different seating/standing areas will access communal areas for concessions and toilets.
“Showing a wristband when passing through access gates is far easier for both the customer and venue than constantly requesting to see your ticket, and avoids bottlenecks and queues waiting for people to find their ticket in handbags or pockets.
“It also prevents people passing tickets around to access different areas as wristbands aren’t able to be exchanged between people. As the event is sold out, this is something we need to consider to keep you safe.”
In a list of frequently asked questions, they say the reason wristbands can’t be sent out with tickets is because they can be “easily fraudulently copied.”
Those collecting wristbands on Friday will have to wear it until Saturday night.
“We’ve purchased festival style fabric lockable wristbands. You’re therefore able to shower in them and go about your daily business,” organisers said.
They said the Racecourse isn’t a “normal venue” which is not purpose built like other stadiums hence the move.
They added: “Whilst the wristband exchange is open for 13 hours in total this does not mean we need 13 hours to get all customers through.
“These timings were chosen for customer convenience. We’ve analysed a lot of data, including previous Stereophonics stadium customer arrival times, local audience patterns, postcode analysis of ticket purchasers etc.
"This combined with the many years of experience of the many teams involved, gives us the ability to estimate audience arrival patterns. We don’t want you queueing any longer than needs be.”
Gates open at 3pm, with the first support act The Ramona Flowers due to start their set at 4pm.
Pretty Vicious will go on stage at 5pm followed by Llandudno’s own Catfish and the Bottlemen from 6pm.
The Stereophonics will perform from 7.40pm.