Billed as an immersive concert experience, showcasing the entire performance of Eilish's "Happier Than Ever Tour" at London's O2 Arena, the screening sold out cinemas all over.

Source: https://collider.com/billie-eilish-swarm/

During the emotional climax to "Barbie," Billie Eilish's breathy, dreamlike voice sings "What Was I Made For?" over grainy recordings of brides, mothers, grandmothers, families, and friends sharing tender moments.

Source: https://www.slashfilm.com/1347102/margot-robbie-cast-crews-loved-ones-made-barbies-emotional-climax-reality/

In terms of clashes, Billie Eilish's set will clash with Andy C (9.45pm to 11.15pm) on the Radio 1 Dance Stage.

Source: https://www.getreading.co.uk/whats-on/whats-on-news/billie-eilish-reading-festival-2023-27583114