South West Four, a.k.a. SW4, is a two-day festival held in Clapham, London. It began in 2001 as a gathering of local residents with a few hundred people. In 2004, it was operated as an official event for the first time, so its history as a festival is relatively new. Hosting an electronic music festival in the heart of a city—especially somewhere as large as London—is very rare. With the introduction of extended opening hours, the festival now features up to 20 hours of top DJs and live sets.

South West Four, a.k.a. SW4, is a two-day festival held in Clapham, London. It began in 2001 as a gathering of local residents with a few hundred people. In 2004, it was operated as an official event for the first time, so its history as a festival is relatively new. Hosting an electronic music festival in the heart of a city—especially somewhere as large as London—is very rare. With the introduction of extended opening hours, the festival now features up to 20 hours of top DJs and live sets.