The theme of the event will be Health and Wellbeing, to tie in with the charity’s current Homeless Health Matters Campaign.
St Mungo's Broadway helps people recover from the issues that create homelessness, providing a bed and support to more than 2,500 people a night who are either homeless or at risk, and works to prevent homelessness, helping about 25,000 people a year.
The event is held in aid of the charity’s work to support homeless people in London and across the South of England.
Guests will be enjoying speeches by staff and clients from St Mungo’s Broadway.
The garden party will also include refreshments, canapés and a raffle.