Slam Dunk, the UK’s biggest independent rock festival, has dropped its second and final wave of artists, locking in a massive line-up for its 20th anniversary in 2026. Joining previously announced headliners Good Charlotte and Sublime, Kentucky’s hardcore heavyweights Knocked Loose lead the latest additions, alongside more than 20 new names spanning pop-punk, emo, ska, metal and beyond.

Slam Dunk Festival has revealed the first batch of artists set to perform at its 2026 event, marking the festival’s 20th birthday with what organisers promise will be “the biggest and best Slam Dunk yet.” The festival’s southern edition takes place at Hatfield Park on Saturday 23 May 2026, headlined by a European-exclusive set from pop-punk icons Good Charlotte.