I'm not a fan of Biebs, but would definitely take the chance to see him. Hope he's gonna make it.
Otherwise Gorillaz have time on friday and no upcoming show in Hungary. But they've been at Sziget in 2018 (just like Dua Lipa and AM). Can't see they put on the same three headliners.
Chemical Brothers are also free on friday. (probably not that interesting for day ticket sellings)
Hopefully it won't be another EDM DJ.