Just a single anecdote but one of my fave memories from all the Reading festivals I've gone to.
We were in the front pit in 2022 waiting for the 1975 to come on. There was an American couple we chatted to, they said they had booked the trip just to see RATM and had never listened to the 1975. Said to them you gonna love this. Their faces were like 😮 😮 as the band came on and one song in they were pushing forward to get closer to the stage. Rarely seen such an immediate 'dunno who they are but they're great' reaction 😄