The Full Effect programme, led by Harry and set up by the Royal Foundation, seeks to combat youth violence.'Ms Markle cannot wait to meet many of the young people Prince Harry has told her so much about,' Mr Knauf said.
He added the away day will begin with a civic welcome at the National Justice Museum followed by a walkabout where they will be able to greet members of the public as a couple for the first time.
In 2005, the monarch attended the religious blessing of the Prince of Wales and the Duchess of Cornwall - both divorcees - in St George's, but did not go to their civil ceremony beforehand in the Windsor Guildhall.
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The couple have shunned a larger wedding at Westminster Abbey or St Paul's for a more intimate church service at St George's, where his father Charles had a blessing after marrying Camilla in the nearby Guildhall in 2005.
It also means Queen and Prince Philip can easily travel to the wedding of the year as it was revealed that the royal family will pay for the event, the music, the flowers and the reception.
American Meghan, who has relocated from her home in Toronto, Canada, will also be taking British citizenship to before May, a process that usually takes years.
It is not clear whether the actress will retain her US citizenship and become a dual national in the future.
The actress' divorced parents Thomas Markle and Doria Ragland will both be there but it's not known if her father will walk her down the aisle.
It has also emerged today Meghan will not be continuing her work with the UN or other organisations, but instead will starting her charity work as a full-time royal afresh and begin touring the country with Harry.
The actress will not be continuing her work on gender with the UN or with other organisations, but instead will starting her charity work as a full-time royal afresh.
The exact date of the wedding will be revealed a later stage.
There will also be a walkabout by the bride and groom-to-be - a royal rite of passage for the future royal.