July's visit to Blessed Sacrament school in the London borough of Islington will include meeting project staff and the school's head teacher. The Duchess will later sit in on a counselling session.
The Duchess of Cambridge in 2014
The project helps children who have been affected by parental addiction. John will once again attend the visit with Kate, and the pair will listen to speeches towards the end of the trip.
During her Manchester visit last year, Kate spoke of her desire to help children in need.
"Last year I asked The Royal Foundation, which I share with William and Harry, what could be done to help these children in partnership with our foundation, Comic Relief work, to explore this issue," said Kate during a three-minute address.
The Duchess holds a number of charitable patronages, many of which complement the three key areas that The Royal Foundation of The Duke and Duchess of Cambridge and Prince Harry, established in 2009, aim to make their focus.
The Duchess of Cambridge launches the project in 2013
These include The Art Room, The National Portrait Gallery in London, and East Anglia’s Children’s Hospices, for which she released a touching message in support of Children's Hospice Week.