For the third edition of its annual International Women’s Day Auction, Art on a Postcard has commissioned more than 200 female-identifying artists to create 6x8in masterpieces. This year’s lineup includes New York-based painter Philemona Williamson and British painter Charmaine Watkiss, who is inspired by her research into the African Caribbean diaspora. All proceeds support The Hepatitis C Trust’s work in women’s prisons, including a freephone helpline and easy-access treatment; bidding starts at £50. Until 15 March, artonapostcard.com
