For the solo outing, Mary sported a chic pair of black pants a black turtle neck and a beautiful pink and black floral shirt.
The Princess accessorised the look with matching pink earrings and a black coat to stave off the chilly weather outdoors.
She opted to wear her hair loose and carried a black handbag for the event.
Mary was all smiles at the conference, where she gave a speech for those attending.
The event comes after Mary and Frederick made a visit to Latvia to celebrate the country’s 100-year anniversary of independence.