The Brockwell Bounce festival in the park from 30 May to 1 June is looking for local businesses, artists and makers for a series of three community markets.
They will be designed to showcase local producers and provide an opportunity for them to get their work in front of a large festival audience.
The Create Foundation is seeking artists and makers who have a product they would like to put in front of the community.
The Brockwell Bounce festival site holds 5,000 people.
There is a £10 charge to hire a stall for a day but the organisers say they would be happy to provide flexibility for people for whom price might be a barrier.