Members of the Kennedy family travelled to Trim, Co Meath, for the opening of an exhibition dedicated to Dot Tubridy who was a long time friend of the family and an unofficial Irish ambassador to the US.
Ms Tubridy is credited with starting the tradition of the Taoiseach presenting US Presidents with shamrock in a Waterford Crystal bowl.
The exhibition entitled "Dear Dot" was officially opened by Courtney Kennedy Hill, daughter of Robert Kennedy, and Sydney Kennedy Crawford McKelvy, daughter of Patricia Kennedy, on the first anniversary of Ms Tubridy's death.
It includes letters written to her by members of the Kennedy family, memorabilia from US election campaign, and audio messages from leading Kennedys including John Kennedy.
The collection was donated by Ms Tubridy's family who still live locally.
Ms Tubridy was from Kilkenny but was living in Trimblestown stud near Trim when her husband Captain Michael Tubridy was killed in a horse riding accident in 1954.
Captain Tubridy was a footballer and Army showjumper who met fellow equestrian Ethel Skakel, then fiancé of Robert Kennedy at a showjumping event in Madison Square Garden in 1946.
The two couples became friends and following her husband's death Dot Tubridy became Waterford Crystal's ambassador to the US and started the tradition of presenting shamrock on St Patrick's Day in the company's bowl.
Speaking at the opening of the exhibition Courtney Kennedy Hill - who was Ms Tubridy's goddaughter - said she was instrumental in bringing John F Kennedy to Ireland and every member of the Kennedy clan after that.
She said over the years Dot found every businessperson she could to get them to invest in Ireland and politicians to help with the troubles in the North.
RTÉ presenter Ryan Tubridy, who is a cousin of Dot, attended the ceremony as did designer Ib Jorgenson.
Mr Jorgenson's gown, which Dot wore at JFK's inauguration ball, is one of the exhibits.