18 July 1957 at a ceremony attended by American and English lawyers. Since 1957 representatives of the ABA have visited and rededicated the Memorial, renewing pledges to the Great Charter. In 1971 and 1985 commemorative stones were placed on the Memorial plinth. In July 2000 the ABA came: In 2007, on its 50th anniversary, the ABA again visited Runnymede. During its convention it installed as President Charles Rhyne, who devised Law Day, which in the USA represents an annual reaffirmation of faith in the forces of law for peace. Floodlights were installed in 2008 to light the memorial at night. In 2015, in anticipation of the 800th anniversary of the sealing of Magna Carta, the two wooden benches at the memorial were replaced by stone benches. On 15 June, the anniversary day, the ABA, accompanied by US Attorney General Loretta Lynch, rededicated the memorial in a ceremony led by The Princess Royal in the presence of the Queen and other members of the Royal family. The Magna Carta Memorial is administered by the Magna Carta Trust, which is chaired by the Master of the Rolls. Ceremonial tree plantings The Duke of Kent together with David K. Diebold, a Minister-Counselor at the US Embassy in London, planted an oak tree adjacent to the Magna Carta Memorial in 1987, as did P. V. Narismha Rao, Prime Minister of the Republic of India.{{ The Prime Minister left a plaque reading: In 1987 two further oak trees were planted near the Memorial. One, planted by Queen Elizabeth II, marked National Tree Week. Another, planted by John O. Marsh, Secretary of the Army of the US, has a plaque which reads: The Jurors The Jurors artwork was commissioned by Surrey County Council and the National Trust to mark the 800th anniversary of the sealing of Magna Carta. The sculptor Hew Locke created 12 bronze chairs each of which is decorated with symbols of past and present struggles for freedom, equality and the rule of law. The artist / sculptor invites participants to sit, reflect upon and discuss the themes represented. In the image the back of the chair nearest the viewer is a representation of Nelson Mandela's prison cell on Robben Island, South Africa. The portrait seen of the further chair is of Lillie Lenton wearing insignia related to the imprisonment and activism of suffragettes. The installation was inaugurated at Runnymede by Prince William during