An extra 1,000 tickets for the Millennium Stadium tsunami concert in Cardiff have sold out in 20 minutes.
The tickets were made available from at lunchtime on Tuesday by telephone only and were quickly snapped up.
Saturday's gig features stars such as Keane and Eric Clapton - and a late addition, Lulu - and will be broadcast by the BBC on tv, radio and online.
The first batch of 60,000 tickets sold in three days and the stadium said no more will now be made available.
Producers said they waited to see the size of the stage before deciding if more tickets could be made put on sale.
Veteran Scottish singer Lulu, who shot to fame on the back of her hit single Shout in the 1960s, is the latest star to join the line-up.
Lulu has been a star for more than 40 years
She will join acts like the Manic Street Preachers, Jools Holland, Embrace, Badly Drawn Boy, Aled Jones, Charlotte Church, and Stereophonics' frontman Kelly Jones.
Still more acts are expected to be announced for the concert, a stadium spokeswoman said.
Stadium manager Paul Sergeant said the main show would begin at 1530 GMT, but up-and-coming north Wales band Camera had volunteered to play as the audience were arriving from 1500 GMT.
The show is being broadcast by different outlets of the BBC.
BBC Two will join the concert from 1800 to 1900 GMT.
BBC One Wales will carry the concert live from 2100 to 2200 GMT and will return after the Ten O'clock News until the end of the event.
BBC Two will show further network television coverage from 2300 GMT onwards.
The entire concert will also be shown live by BBC Wales on the Welsh fourth channel, S4C, from 1500 GMT until its late night finish. Coverage on S4C digital will enable digital satellite viewers all over the UK to join the whole event.
BBC Wales has also offered to give access to two hours of the concert to enable the Millennium Stadium to make the television coverage available to other broadcasters.
There will be live coverage of the whole concert on BBC Radio Wales as well as extensive broadcasts on BBC Radio Two.
In a special deal, BBC Wales has also agreed to make an audio-visual feed available to BT to enable the whole concert to be broadcast around the world on broadband via the worldwide web.