We just did two in Europe for the first time, Primavera Sound in Barcelona and Rock Werchter in Belgium. We saw:
PS: Gorillaz, Nick Cave, The National, Tyler the Creator, Tame Impala, Charli XCX, King Gizzard, Dinosaur Jr, Rina Sawayama, Wet Leg, DJ Shadow, Fred Again, Mogwai, Tropical Fuck Storm, Pond, Shellac, Faye Webster, Teto Preto and others.
RW: Pearl Jam, Metallica, The Killers, RHCP, Turnstile, Bicep, Pixies, The War on Drugs, Beck, Royal Blood, Jorja Smith, Idles, Keane, Fever 333, Phoebe Bridgers, Nothing But Thieves, First Aid Kit, Haim, Fontaines D.C, Lewis Capaldi, Anne-Marie and bits of others.
Primavera was great but horribly organised in many ways. Barely any free water for ~80k people in Spain, huge queues for everything, felt too crowded. Would go again if they fix that crap.
Rock Werchter was the best festival we've ever been to. Everything is so easy and smooth from getting there to having water everywhere, almost no bar queues, good crowd management, friendly people, not to mention the most insanely stacked lineups you've ever seen. Will be back again for sure.