PinkPantheress, Noga Erez, Remy Bond, Rocco Ritchie, Benson Boone, KJ Apa, Cara Delevingne, Darren Criss, Dixie D’Amelio, Gunna, Marion Cotillard, Omar Apollo, Rebecca Black, Rufus Wainwright seen at Amoeba Music for Pre-Grammy Party