Travis, Texas and Ronan Keating are among the acts who will perform at the Live 8 concert in Edinburgh.
Travis are among the acts confirmed to play the event
The free Murrayfield show has been timed to coincide with the Long Walk to Justice rally in the city on 6 July.
Organiser Midge Ure dismissed fears the event could attract trouble and predicted it would be a party rather than "a dreadful situation".
The line-up includes Daniel and Natasha Bedingfield, The Thrills, Dido, McFly, Damon Albarn, Embrace and Snow Patrol.
Wet Wet Wet, The Proclaimers, Jamie Cullum, The Zutons, Youssou N'Dour and Annie Lennox will also play.
Midge Ure is organising a rally and concert in Edinburgh
People will be able to apply for tickets by text message.
Ure and fellow organiser Geldof, the men behind the 1980s Live Aid campaign, plan a series of international concerts on 2 July as part of their call to world leaders for renewed action on global poverty.
They chose Edinburgh as the final destination for the Long Walk to Justice on 6 July, the first day of the Gleneagles G8 summit.
Geldof has called for a million people to descend on the city for the rally, but Ure told Tuesday's media conference that he did not think the number would be that high.
"We've no idea who's going to come, what's going to come, but we know the type of people who will come," he said.
"I'm bringing my family, it will be families, it will be people who believe in the cause.
"To drag your backside up from London all the way to Edinburgh to smash a window doesn't make any sense. It's crazy.
"The people who will be there will be there for the party, there for the entertainment, there for the music."
He said he would not bring his own family to an event which he thought could be "a dreadful situation".
"I'm bringing my family here to celebrate and enjoy and be there and stand up and be counted," he said.
Natasha Bedingfield and her brother Daniel will perform
Council officials had initially voiced concerns at the prospect of a million people descending on the city.
But Edinburgh City Council leader Donald Anderson said the city welcomed playing its part "in this defining moment in history".
"It is an enormous challenge and we are working around the clock to make sure we deliver," he said.
"We intend to ensure that events in the run-up to the G8 summit pass off successfully and safely."
He urged those planning to make the journey to ensure that they have arranged transport and accommodation.
Meanwhile, Shadow Scottish Secretary Eleanor Laing called on Geldof to reverse his call for a million people to make their way to Edinburgh.
Speaking during Scottish Questions in the Commons, she said it was not a good idea to "flood" the city with so many protestors.
Scottish Secretary Alistair Darling said efforts should be made to ensure that the people coming to Edinburgh could be accommodated safely and that the demonstration was peaceful.
"Edinburgh is an extremely hospitable place and handles thousands and thousands of people each year but there does come a point when even Edinburgh's renowned hospitality reaches the stage where we are full up," he said.