From 2-6pm, the outside stage in St James Square will host music, dancers, a fashion show, quiz and comedy.
St James Square will also be alive with pop-up stalls, tasty food and drink, competitive events, as well as a treasure hunt, games and stalls manned by local organisations and charities.
Meanwhile over at St James Church, there will be face painters, a bouncy castle, bands, gymnastics, choirs, an art exhibition plus more games and entertainment.
The event will also act as a fundraiser for:
WAVE (We Are all Valued Equally) at St James Church, an outreach programme for young adults with learning difficulties.
LCCCP (London Centre for Cerebral Palsy).