GREENWICH + DOCKLANDS INTERNATIONAL FESTIVAL: The ever-creative (and, even better, free!) GDIF returns, with family-friendly outdoor events including a recreation of the Northern Lights, a riverside fire garden, and a giant birdcage roaming the streets at dusk, with video projections of birds released onto the streets. Greenwich and surrounds, 27 August-11 September

YAM CARNIVAL … … … … …