Celebrities from across the UK are taking part in the football match, which is taking place in May at Birmingham City Football ground.
The match, which has been organised by the mother of Harry Moseley, is intended to raise funds and awareness of Harry's work, which has now helped many people with similar conditions.
Lee Latchford-Evans from pop group Steps said Harry was a special boy and his work must continue.
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A largely dry start this morning, with some sunshine.