I know there's been some talk of Phoebe Bridgers, but I reckon her current popularity would maybe make it unlikely she would headline EOTR (though not impossible - not sure she'd be more costly than Pixies). But she could play with Boygenius. Lucy Dacus told us last year (and not in the usual way that artists do it) that it's her favourite festival, so can see her being keen. New album announced: https://pitchfork.com/news/boygenius-announce-new-album-the-record-share-three-songs-listen