Here's the who, what and where of Saturday's Live Aid concerts: London

At Wembley Stadium (alphabetically): Boomtown Rats, David Bowie, Phil Collins, Elvis Costello, Dire Straits, Bryan Ferry, Elton John, Howard Jones, Nik Kershaw, Julian Lennon, Paul McCartney, Alison Moyet, Queen, Sade, Spandau Ballet, Status Quo, Sting, the Style Council, the Who, U2, Ultravox, Wham!, Paul Young.

Prince Charles and Princess Diana will open the concert and introduce the opening act, Status Quo. Philadelphia

At John F. Kennedy Stadium (according to time slots but not necessarily in this order):

9 a.m. to noon: Joan Baez, the Hooters, the Four Tops, Billy Ocean, Black Sabbath with Ozzy Osbourne, Run-DMC, Rick Springfield, REO Speedwagon, Crosby Stills and Nash, Judas Priest.

Noon to 5 p.m.: Bryan Adams, the Beach Boys, Tears for Fears, Simple Minds, the Pretenders, Santana with Pat Metheny, Ashford and Simpson, Teddy Pendergrass, the Thompson Twins.

5 to 8 p.m.: Tom Petty, Kenny Loggins, the Cars, Neil Young, Power Station, Eric Clapton, Phil Collins, Robert Plant, Jimmy Page.

8 to 11 p.m.: Duran Duran, Madonna, Patti La Belle, Hall and Oates with David Ruffin and Eddie Kendricks, Mick Jagger, Tina Turner, Bob Dylan.

On-stage hosts will include Jack Nicholson, Don Johnson, Chevy Chase, Dan Aykroyd and Joe Piscopo. Television

Coverage is scheduled to revolve around two music segments an hour, interspersed with commercials, inspirational messages and telethon appeals from celebrities and world leaders. Segments from the London and Philadelphia concerts will be intercut, and there will also be segments from Australia, Holland, the Soviet Union and several other countries.

MTV will televise the entire concert, from 3 a.m. EDT (the starting time of the Australian concert; London kicks off at 7 a.m.) to 11 p.m. (or whenever the Philadelphia concert ends). MTV's veejays will serve as hosts.

An ad hoc network of 105 independent stations, including WJZ (Channel l3) in Baltimore and WDCA (Channel 20) in Washington, will carry the concert from 7 a.m. to 6 p.m. Hosts for this feed include Bette Midler, Billy Crystal, Sheena Easton, Kenny Loggins, Melissa Manchester, Randy Newman, Deniece Williams and Grace Slick.

ABC television will carry the concert in prime time, 8 to 11 p.m., with Dick Clark hosting.

Coverage will vary from system to system, as each has options on what it will carry from various concert sites. Radio

The ABC Radio Network, which includes WRQX-FM (107.3) locally, will simulcast the concert in stereo from 6 a.m. to midnight. So will WAVA-FM (105.1).

There reportedly will be no video, film or record projects subsequent to Live Aid, undoubtedly because it's bound to be one of the most home-taped events in recent years.

The concert will go on, rain or shine.