- On 1966-08-21, Andy Summers performed with Zoot Money's Big Roll Band at the Ricky Tick in Hounslow, England, UK.
- On 1968-08-21, Andy Summers performed with Eric Burdon And The Animals at the Whisky a Go Go in Hollywood, CA, USA.
- On 1972-08-21, Stewart Copeland may have worked as "artistic director" for Cat Iron (a band with Kim Turner on drums) at the Marquee Club in London, England, UK.
- On 1976-08-21, Curved Air rehearsed at Stewart Copeland's home in London, England, UK.
- On 1977-08-21, The Police mixed Dead End Job at Pathway Studios.
- On 1978-08-21, Stewart Copeland wrote the Kinetic Ritual manifesto and then met Kim Turner, Andy Summers and Sting at Faulty Products in London, England, UK.
- On 1979-08-21, The Police rehearsed - probably in London, England, UK.
- On 1981-08-21, The Police attended Miles Copeland's wedding in New York, NY, USA - while The Flying Padovanis performed in London, England, UK.
- On 1982-08-21, The Police performed at the Five Seasons Center in Cedar Rapids, IA, USA.
- On 1983-08-21, The Police performed at the Capital Centre in Landover, MD, USA.
- On 1985-08-21, Sting performed in Costa Mesa, CA, USA - while Stewart Copeland was in New York, NY, USA.
- On 1987-08-21, Sting was probably still shooting Stormy Monday on Newcastle, England, UK.
- On 1988-08-21, Sting performed at the Lake Compounce Festival Park in Bristol, CT, USA.
- On 1991-08-21, Sting performed at the Target Center in Minneapolis, MN, USA.
- On 1993-08-21, Sting performed at the Radrennbahn in Hildesheim, Germany.
- On 1996-08-21, Sting performed at the Greek Theatre in Los Angeles, CA, USA.
- On 2009-08-21, Stewart Copeland performed at the La Jolla Music Society 2009 SummerFest concert series at MCASD Sherwood Auditorium in La Jolla, CA, USA.
- On 2010-08-21, Henry Padovani is on vacation on Corsica, France.
- On 2016-08-21, Stewart Copeland arrived in Basel, Switzerland.