This year marks the 20th anniversary of The Hepatitis C Trust, a patient-run charity aiming to end hepatitis C in the UK by 2030. To celebrate, Art on a Postcard is organising its largest sale yet, uniting 250 artists, each of whom have created a one-of-a-kind A6 artwork. Standout mini-masterpieces include British sculptor Schoony’s 3D printed graphite boy soldier, a vibrant ink and watercolour landscape by Birmingham-born painter Hurvin Anderson and nudes by cartoonist Weef. The initiative hopes to raise around £75,000, all of which will go to the Trust. Bidding starts at £50. Until 25 November, artonapostcard.com