More bands have been added to the 2020 Slam Dunk Festival in the UK. That event will be held in Leeds on May 23 and Hatfield on May 24. Here’s the updated lineup: Sum 41, Don Broco, NOFX, Billy Talent, State Champs, The Used, The Story So Far, Refused, Pennywise, Reel Big Fish, Mayday Parade,…