If you’re not sure what ACL is yet, you’ve most likely been living under a rock or only recently discovered the existence of popular music. Originally a three-day festival, the event held in Austin’s Zilker Park has evolved into a two-weekend affair that mixes rock, indie electronic, hip-hop, EDM and R&B. Heavy hitters Metallica, Radiohead and Jay-Z have headlined in the past. This year, Childish Gambino (who was slated to play last year but cancelled because of a foot injury), Guns ’N’ Roses, The Cure, Lizzo and weirdo popstress Billie Eillish are all rocking sets.