Ex-England goalkeeper David Seaman, Olympic athlete Kelly Holmes and dancer Bonnie Langford are among competitors.
Okoro and Meadows set personal bests in Birmingham, with Okoro just 0.06secs outside the British record held by double-Olympic champion Kelly Holmes.
Meanwhile Jenny Meadows, who beat Kelly Holmes' seven-year-old British 800m indoor record at the UK Indoor Grand Prix in February, runs in the 800m.
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Athlete Kelly Holmes was eliminated after a skate-off with Bonnie Langford.
BBC: Seaman has appeared alongside Kelly Holmes on the ITV show
Tennis star Heather Watson was the only person to make it onto both lists as she joined the likes of Wayne Rooney, David Beckham and Dame Kelly Holmes.
Celebrities including TV presenter Gabby Logan and her husband, former international rugby player Kenny, as well as sport stars Tim Henman and Kelly Holmes have showed their support.
ATHENS, Greece -- Briton Kelly Holmes produced a masterful 1, 500 meters performance to win gold on Saturday and become only the third woman in Olympic history to complete the middle-distance double.
The event was broadcast on BBC Breakfast, Radio 4 and Radio 2 - where Chris Evans took part in the ceremony alongside Moira Stewart, Dame Kelly Holmes and Martin Creed himself.
The cast, which is gold-coloured, was originally exhibited alongside body cast sculptures of Dame Kelly Holmes, Kriss Akabusi, Sally Gunnell and Paralympian Darren Leach in Body Casting Olympians at the Mall Galleries in May 2012.
Meadows, currently second in the 800m rankings, is slightly slower on paper than Russian Yevgeniya Zinurova but demonstrated her speed last weekend by breaking Kelly Holmes' UK record with a time of one minute 59.11 seconds.
They are Mayo goalkeeper Peter Burke, Anthony Lynch (Cork), Paddy Christie (Dublin), Colin Holmes (Tyrone), Tomas O Se (Kerry), Declan Meehan (Galway), Evan Kelly (Meath), Joe Bergin (Galway), Paul Barden (Longford), Derek Savage (Galway) and Ray Cosgrove (Dublin).
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