Over the next three days more than 100 Welsh athletes with learning disabilities will be competing against others from around the UK at the Special Olympics.
The Opening Ceremony for the Games takes place tonight. The competitors have spent much of the afternoon preparing for a parade at the famous Royal Crescent in the city.
Tom Sheldrick caught up with some of them as they set off from Cardiff.
Susan Boyle who came to fame on ITV's Britain's Got Talent has been wowing the crowds at the Special Olympics National Summer Games in Bath
The Opening Ceremony for the Special Olympics National Summer Games is being held tonight. More than 100 Welsh competitors are taking part.
144 Welsh athletes, coaches and carers are heading to the Special Olympics GB National Summer Games in Bath next month.