Masterminded by Mark Pavey, Michael Shaw and Dafna Talmor, the sustainable, living roof at Beaconsfield has been more than a year in the making, built by volunteers, working under strict principles, only from donated and salvaged materials. Sunday 18 September at 2pm: Green Walk: Local guerrilla gardener and artist Caroline Todd will lead a green walk from Tate Britain to Beaconsfield’s own patch of green. Assemble at Tate Britain Millbank Entrance for a prompt 2pm start. Places on the green walk are limited. To reserve a FREE place contact [email protected] Sunday 18 September, 3.30-8pm: Living Roof Launch Official launch party hosted by SpaceShip Earth artists with food, music, DJ's film screenings and a plant-cuttings swap throughout the day.