Australia competed at the 2004 Summer Olympics in Athens, Greece from 13 to 29 August 2004. Australian athletes have competed in every Summer Olympic Games of the modern era. The Australian Olympic Committee sent a total of 470 athletes to the Games to compete in 29 sports.
Djibouti took part in the 2008 Summer Olympics, which were held in Beijing, China from 8 to 24 August 2008. The country's participation at Beijing marked its sixth appearance in the Summer Olympics since its debut in 1984. The Djibouti delegation included two athletes in 2008; Mahamoud Farah, a middle-distance runner, and Fathia Ali Bouraleh, a sprinter. Hussein Ahmed Salah, Djibouti's only Olympic medalist, was selected as the flag bearer for both the opening and closing ceremonies despite not competing in 2008. None of the Djiboutian athletes progressed further than the heat round.
Mauritania competed at the 2012 Summer Olympics in London, which was held from 27 July to 12 August 2012. The country's participation at London marked its eighth appearance in the Summer Olympics since its debut in the 1984 Summer Olympics. The delegation included two track and field athletes, Jidou El Moctar and Aicha Fall, who were selected to the team by wildcard places, as the nation had no athletes that met either the "A" or "B" qualifying standards. Moctar was selected as flag bearer for the opening ceremony while a LOCOG Games Maker carried it for the closing ceremony. Neither of the two athletes progressed beyond the heats.
Singapore competed at the 2020 Summer Olympics in Tokyo. Originally scheduled to take place from 24 July to 9 August 2020, the Games were postponed to 23 July to 8 August 2021, because of the COVID-19 pandemic. It is the nation's seventeenth appearance at the Summer Olympics since its debut at the 1948 Games. In addition, Singapore was part of the Malaysian team at the 1964 Summer Olympics in Tokyo, but did not attend at the 1980 Summer Olympics in Moscow, because of its support for the United States boycott. The opening ceremony flag-bearers for Singapore are table tennis player Yu Mengyu and shuttler Loh Kean Yew. Diver Jonathan Chan is the flag-bearer for the closing ceremony.
The men's 4 × 110 yards relay event at the 1966 British Empire and Commonwealth Games was held on 13 August at the Independence Park in Kingston, Jamaica. It was the last time that the imperial distance was contested at the Games later replaced by the 4 × 100 metres relay.
The men's 4 × 440 yards relay event at the 1966 British Empire and Commonwealth Games was held on 13 August at the Independence Park in Kingston, Jamaica. It was the last time that the imperial distance was contested at the Games later replaced by the 4 × 400 metres relay.
The women's 80 metres hurdles event at the 1966 British Empire and Commonwealth Games was held on 11 and 13 August at the Independence Park in Kingston, Jamaica. It was the last time that the distance was contested at the Games later replaced by the 100 metres hurdles.
The women's 880 yards event at the 1966 British Empire and Commonwealth Games was held on 11 and 13 August at the Independence Park in Kingston, Jamaica. It was the last time that the imperial distance was contested at the Games later being replaced by the 800 metres.
The men's 1 mile event at the 1966 British Empire and Commonwealth Games was held on 11 and 13 August at the Independence Park in Kingston, Jamaica. It was the last time that the imperial distance was contested at the Games later being replaced by the 1500 metres.
The men's 120 yards hurdles event at the 1966 British Empire and Commonwealth Games was held on 11 August at the Independence Park in Kingston, Jamaica. It was the last time that the imperial distance was contested at the Games later replaced by the 110 metres hurdles.
The men's 440 yards event at the 1966 British Empire and Commonwealth Games was held on 8 and 11 August at the Independence Park in Kingston, Jamaica. It was the last time that the imperial distance was contested at the Games later replaced by the 400 metres.
The men's 220 yards event at the 1966 British Empire and Commonwealth Games was held on 8 and 11 August at the Independence Park in Kingston, Jamaica. It was the last time that the imperial distance was contested at the Games later replaced by the 200 metres.
The women's 220 yards event at the 1966 British Empire and Commonwealth Games was held on 8 and 11 August at the Independence Park in Kingston, Jamaica. It was the last time that the imperial distance was contested at the Games later replaced by the 200 metres.
The men's 880 yards event at the 1966 British Empire and Commonwealth Games was held on 6 and 8 August at the Independence Park in Kingston, Jamaica. It was the last time that the imperial distance was contested at the Games later being replaced by the 800 metres.
The men's 440 yards hurdles event at the 1966 British Empire and Commonwealth Games was held on 6 and 8 August at the Independence Park in Kingston, Jamaica. It was the last time that the imperial distance was contested at the Games later being replaced by the 400 metres hurdles.
The women's 100 yards event at the 1966 British Empire and Commonwealth Games was held on 6 and 8 August at the Independence Park in Kingston, Jamaica. It was the last time that the imperial distance was contested at the Games later replaced by the 100 metres.
The men's 100 yards event at the 1966 British Empire and Commonwealth Games was held on 5 and 6 August at the Independence Park in Kingston, Jamaica. It was the last time that the imperial distance was contested at the Games later replaced by the 100 metres.
The women's 220 yards event at the 1958 British Empire and Commonwealth Games was held on 22 and 24 July at the Cardiff Arms Park in Cardiff, Wales.
The women's 100 yards event at the 1958 British Empire and Commonwealth Games was held on 19 and 22 July at the Cardiff Arms Park in Cardiff, Wales.
