The Princess Royal is to visit the county on December 17 for a fundraising concert at Dorchester Abbey.
Princess Anne will be guest of honour at The Coming of Christmas, a candlelit performance by The Choir of Magdalen College, Oxford.
The event will raise money for The Home Farm Trust, a charity which provides a network of community-based services for adults with learning difficulties.
The charity has 14 centres across England and Princess Anne is its patron.
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