ASKAP offers powerful new capabilities for studying the polarised and magnetised Universe at radio wavelengths. POSSUM (the Polarisation Sky Survey of the Universe’s Magnetism) is a groundbreaking survey with three primary objectives: (1) to create a comprehensive Faraday rotation measure (RM) grid of up to one million compact extragalactic sources across the southern sky; (2) to map the intrinsic polarisation and RM properties of a wide range of discrete extragalactic and Galactic objects; and (3) to contribute interferometric data with excellent surface brightness sensitivity, which can be combined with single-dish data to study the diffuse Galactic interstellar medium. The POSSUM team are holding a busy week at Marsfield (and on-line) this week to review progress and to advance preparations for papers describing results from the survey. (Image credit: Wasim Raja)