Kate, Duchess of Cambridge, will be joining Meghan for the three Remembrance events along with other members of the royal family.
Pregnant Meghan has not been seen in public since her Commonwealth tour with Prince Harry ended last week.
But the Duchess of Sussex, 37, will participate in three events this weekend, while the United Kingdom marks the centenary of the end of the First World War.
Meghan and Kate will participate in the annual Royal Festival of Remembrance at the Royal Albert Hall on Saturday.
Prince William and Harry will join their wives and other royals, including the queen.
And Prince Charles and Camilla, the Duchess of Cornwall, will be back in the UK from their nine-day west Africa engagement tour.
On Sunday, Meghan and Kate must attend the annual Day of Remembrance service at the Cenotaph with their husbands.
Members of the royal family attend the service that takes place on the second Sunday of November each year and there will be thousands of similar events across the country while the nation observes a two-minute silence at 11 am.
The Queen will see the service from the balcony of the Foreign & Commonwealth Office building.
But Prince Philip, who renounced official royal duties in 2017 and underwent a hip replacement operation at the beginning of this year, is not expected to participate.
Charles will depose a crown on behalf of the Queen, as a sign of increasing responsibility for the throne.
And a horse will lay a wreath on behalf of the Duke of Edinburgh.
In the evening, Meghan and Kate will participate in their third weekend engagement at a service to celebrate the Armistice Centenary at Westminster Abbey.
The Duke and Duchess of Sussex and the Duke and Duchess of Cambridge will join the ninety-year-old monarch at the event that marks the 100th anniversary of the signing of the armistice, which marks the end of the First World War.
It comes after Harry and Meghan have delighted real fans with their busy 16-day tour that has seen them visit Australia, Fiji, Tonga and New Zealand.
Meghan announced her pregnancy as she landed in Sydney on October 15 for the first day of the trip.
The Duchess of Sussex has withdrawn from a series of commitments in Australia because of her pregnancy.
But since then, Meghan has not shown signs of slowing down as she prepares for her Memories, just over a week after returning from New Zealand.
However, Meghan will leave Harry to complete a solo event while she is scheduled to visit the Field of Remembrance at Westminster Abbey alone.