Mark Kermode takes part in a movie marathon of short film screenings, Hansel of Film, a relay race of short film screenings taking place around the UK. Alastair Sooke looks at the transformation of disused oil tanks into a sleek new art space at Tate Modern. Also, Cerys Matthews shares her passion for poetry with Fiona Shaw and gets a sneak preview of Peace Camp, a series of unique living artworks across the UK coastline from Northern Ireland to Cornwall.