International Clash Day is observed on February 5, unless that date falls on a Saturday or Sunday, in which case it is celebrated on the following Monday. This day honors the influential punk-rock band The Clash, which significantly impacted various music genres including reggae, pop, disco, and rock. The celebration began as a grassroots movement on February 7, 2013, initiated by John Richards, a radio host at KEXP, who played The Clash's songs throughout the day. While specific customs are not detailed in the source, the day serves as a tribute to the band's legacy and the messages conveyed through their music. International Clash Day is celebrated annually, ensuring that the band's contributions to music continue to resonate with fans.