Annual community carnival with procession (1.30pm-2.15pm) from Lower Marsh to Waterloo Millennium Green via Westminster Bridge Road, Baylis Road and the Tanswell Estate.
This year's theme is 'circus' and events include live music, circus workshops and performances.
Lambeth Council leader Lib Peck and and Vauxhall MP Kate Hoey will join in the festivities.
At 2.30pm the National Theatre presents Small Wonders – a performance for the whole family - on the Millennium Green.
From 3pm to 4pm workshops continue on the green for all ages, and the fun carries on into the evening for adults at Cubana and The Walrus on Lower Marsh.
See pictures from 2013.