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As May edges closer and the British weather dares to behave, there’s a familiar buzz in the air, festival season is about to kick off. And in 2026, few events signal that moment quite like Slam Dunk Festival’s 20th anniversary—a landmark edition that feels bigger, heavier, and more nostalgic than ever. Returning to Hatfield Park and Temple Newsam across the late May bank holiday weekend, Slam Dunk has long been the UK’s definitive one-day pilgrimage for pop-punk, emo and hard