- On 1962-04-21, Sting was in Newcastle, England, UK.
- On 1976-04-21, Andy Summers may have performed in Kevin Coyne's band at Kilburn Cinema in London, England, UK.
- On 1977-04-21, Stewart Copeland visited Sting and then Sonja Kristina at the hospital in London, England, UK.
- On 1978-04-21, The Police rehearsed in London, England, UK - while Wayne County & The Electric Chairs recorded in London, England, UK.
- On 1979-04-21, The Police were in Amsterdam, The Netherlands.
- On 1980-04-21, The Police returned to England.
- On 1982-04-21, The Police performed at the Brendan Byrne Arena in East Rutherford, NJ, USA.
- On 1985-04-21, Sting was recording The Dream Of The Blue Turtles at Eddy Grant's Blue Wave Recording Studio in St.Philip, Barbados.
- On 1986-04-21, Sting performed at the Festival Hall in Melbourne, Australia.
- On 1988-04-21, Sting performed at the Arena Civica in Milan, Italy.
- On 1991-04-21, Sting performed at City Hall in Newcastle, England, UK.
- On 1993-04-21, Sting performed at the Royal Albert Hall in London, England, UK.
- On 1995-04-21, Andy Summers performed at the VENUE in Cordoba, Argentina.
- On 1998-04-21, Andy Summers performed at the Pizza Express in London, England, UK.
- On 2001-04-21, Stewart Copeland and the other Oysterhead members recorded The Grand Pecking Order at The Barn in Vermont, USA - while Sting was photographed at a press conference in Amman, Jordan.
- On 2004-04-21, Sting performed at Carnegie Hall as part of the Rainforest Foundation benefit concert.
- On 2007-04-21, The Police rehearsed at Sting's home Il Palagio in Figline Valdarno, Italy.
- On 2009-04-21, Sting was seen at the restaurant "Koi" in Hollywood, CA, USA - while Andy Summers attended a photo lecture in Culver City, CA, USA.
- On 2010-04-21, Sting attended a photo benefit auction in New York, NY, USA.
- On 2012-04-21, Sting attended the Windward School Benefit at Cipriani in New York, NY, USA.
- On 2013-04-21, Stewart Copeland was probably still in France.
- On 2016-04-21, Stewart Copeland skyped with the two web managers of www.stewartcopeland.net from his home in Los Angeles, CA, USA - while Henry Padovani was in Buenos Aires, Argentina.