The Duchess of Cambridge is due to attend a forum on how schools can tackle mental health problems.
The Place2Be school leaders forum will see expert speakers consider how schools can provide practical support to children, young people and their families.
Kate, who is a royal patron of Place2Be, has attended the past two conferences hosted by the charity.
This year's conference, entitled 'I'm Fine!', will include presentations from experts in child psychiatry and psychology, as well as headteachers working in some of the most disadvantaged parts of the UK.
Kate, who is pregnant with her third child, has previously spoken out about supporting children and parents with their mental health.
She has been stepping back into the limelight after suffering from hyperemesis gravidarum - a severe form of morning sickness.
The Duchess will open the conference before joining delegates for the forum in central London.
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