Out of interest, I've made a list of which acts (excluding a couple of bands I know have split up) were announced over the last three years and have yet to play since then.   First announced for 2020: 75 Dollar Bill, Ahmed Fakroun, Alice Boman, Andy Shauf, Angel Olsen, Big Thief/Buck Meek, Blanck Mass, Current Joys, David Thomas Broughton, Disq, Ian Noe, Itasca, Jeffrey Martin, Makaya McCraven, Monophonics, Nadia Reid, Pinegrove, Richard Hawley, Shygirl, Sofia Wolfson, Songhoy Blues, T