LONDON — Get the Union Jacks out and prepare to party: Olympic Stadium is being transformed into a giant jukebox of British pop and pizazz for the ceremony that brings to an end the so-far spectacularly successful London Games.
The Spice Girls and The Who are among the acts celebrating two weeks of sporting competition with a finale that artistic director Kim Gavin calls ‘‘a mashed-up symphony’’ of British hits.
Gavin — who has directed rock tours and London’s 2007 Princess Diana memorial concert — said Saturday he wants the spectacular to be ‘‘the best after-show party that’s ever been.’’
‘‘If the Opening Ceremony was the wedding, then we’re the wedding reception,’’ music director David Arnold told the Daily Telegraph.
Although organizers have tried to keep the ceremony under wraps, many details have leaked out in the British media — and some performers have let the cat out of the bag themselves.
The Who, George Michael, Muse and Ed Sheeran have all said they will take part in a show that will include performances of 30 British hit singles from the past five decades — whittled down by Gavin from a possible 1,000. The Pet Shop Boys, Annie Lennox, and Fatboy Slim will also be on hand to get people dancing.
Gavin said Saturday the show would open with a tribute to the ‘‘cacophony’’ of London life, with a soundtrack ranging from the late Edward Elgar — composer of the ‘‘Pomp and Circumstance’’ march — to The Kinks’ ‘‘Waterloo Sunset.’’ Frontman Ray Davies is expected to perform the 1960s song, a love letter to London.
Thousands of athletes from 204 competing nations will march in and become a standing, milling audience — Gavin dubbed them the ‘‘mosh pit’’ — for the main section of the show, ‘‘A Symphony of British Music.’’
Details of the performers have emerged through tips and photos coming out of the rehearsal venue, an old car plant in east London. While creators of the Opening Ceremony could rehearse for weeks inside the stadium, Gavin and his team had less than a day. between the end of track and field competition and Sunday’s ceremony.
Gavin said he had 17 hours to get a show that involves multiple sets, pyrotechnics and 3,500 volunteer performers ‘‘from a car park to here.’’
The Spice Girls were photographed dancing atop black London taxis, so a rendition of their biggest hit, ‘‘Wannabe,’’ seems likely.
So does an appearance by surviving members of Queen, whose ‘‘We Will Rock You’’ has been ever-present at the Games.
Paul McCartney has already performed at the Opening Ceremony, but it’s inconceivable that there won’t be a bit of Beatles music in a tribute to the best of British pop.
And organizers will want to include younger acts such as Tinie Tempah, Jessie J, Emeli Sande and the Kaiser Chiefs.
Gavin would not say whether he had failed to secure any acts he had hoped to book — though he said two who initially said no changed their mind after seeing the spectacular Opening Ceremony.
‘‘There was no room,’’ he said — but he would not let slip the names involved.
Gavin said the lineup was driven by the songs — a hit parade of pop classics — more than by the artists.