Question: St James's Palace held the first playing of the wedding anthem of Princess Anne, and though no longer the the principle residence of the monarch, it is still the ceremonial meeting place of what group?
Context: Warriparinga (meaning "Windy Place" in the local Kaurna language) is a nature reserve comprising 3.5 ha in the metropolitan suburb of Bedford Park, in the southern suburbs of Adelaide, South Australia.  It has historical, cultural and environmental significance as a traditional Kaurna ceremonial meeting place and as a site of early European settlement.  Also known as Fairford, Laffer's Triangle and the Sturt Triangle, Warriparinga is bordered by Marion Road, Sturt Road and South Road, and is traversed by the Sturt River as it exists from Sturt Gorge to travel west across the Adelaide Plains. St James' Church, Forest Gate was a church in Forest Gate, east London.  Its origins lay in an iron building constructed around 1870 to serve a conventional district.  A parish was formed for it in 1881 from those of Emmanuel Church, All Saints and St John's and its permanent church completed the following year, with an organ moved from St Matthew's Church, Friday Street.  The church was demolished in 1964 and for two years its congregation worshiped in the Durning Hall Community Centre's chapel until the parish was merged with that of St John's.  A new church was built for the St James' congregation at northern end of St James Road in 1968.  The congregation finally moved to St Paul's Church, Stratford in 2014, though the area that had formerly been St James' parish was instead transferred from St John's to St Saviour's the same year. The Palace of Mysore (Kannada: ಮೈಸೂರು ಅರಮನೆ , "maisūru aramāne " ) is a historical palace in the city of Mysore in Karnataka, southern India.  It is the official residence and seat of the Wodeyars and rulers of Mysore, the royal family of Mysore, who ruled the princely state from 1399 to 1950.  The palace houses two "durbar halls" (ceremonial meeting halls of the royal court) and incorporates an array of courtyards, gardens, and buildings.  The palace is in the central region of inner Mysore, facing the Chamundi Hills eastward. Carlton House was a mansion in London, best known as the town residence of the Prince Regent for several decades from 1783.  It faced the south side of Pall Mall, and its gardens abutted St. James's Park in the St James's district of London.  The location of the house, now replaced by Carlton House Terrace, was a main reason for the creation of John Nash's ceremonial route from St James's to Regent's Park via Regent Street, Portland Place and Park Square: Lower Regent Street and Waterloo Place were originally laid out to form the approach to its front entrance ("illustration, right"). St James's Palace is the most senior royal palace in the United Kingdom.  Located in the City of Westminster, although no longer the principal residence of the monarch, it is the ceremonial meeting place of the Accession Council and the London residence of several members of the royal family. Princess Anne's Battery is an artillery battery in the British Overseas Territory of Gibraltar.  It is located on Willis's Plateau at the northern end of the Upper Rock Nature Reserve, above Princess Caroline's Battery.  It was named after Anne, Princess Royal and Princess of Orange, the eldest daughter of George II.  However, its name is often confused with those of other batteries in the area.  In 1732, guns were first mounted on the battery, which also saw action during the Great Siege of Gibraltar.  Princess Anne's Battery was updated in the nineteenth and twentieth centuries, with the latter modernisation entailing the installation of four QF 5.25 inch guns with both anti-aircraft and coastal defence capabilities.  The battery was manned into the early 1980s, after which it was decommissioned.  The guns were refurbished in the early twenty-first century, and represent the world's only intact battery of 5.25 inch anti-aircraft guns.  Princess Anne's Battery is listed with the Gibraltar Heritage Trust. This is a list of residences occupied by the British royal family, noting the seasons of the year they are traditionally occupied.  Members of the Royal Family inhabit their range of residences across the United Kingdom.  Some are royal palaces, owned by the Crown and held in trust by the monarch; others are privately owned.  Balmoral Castle and Sandringham House have been inherited as private property for several generations.  Other royal palaces are no longer residences (e.g. the Palace of Westminster, the Palace of Whitehall).  Some remain in irregular use for royal occasions (such as Hillsborough Castle).  The Royal Palaces enjoy certain legal privileges: for example, there is an exemption from levying duty on alcoholic beverages sold in the bars at the Palace of Westminster and there are exemptions from Health and Safety legislation.  According to "Halsbury's Laws of England", it is not possible to arrest a person within the "verges" of a royal palace (though this assertion is contradicted by a memorandum by the Clerk of the House of Commons in respect of the Palace of Westminster), and when a royal palace is used as a residence (regardless of whether the monarch is actually living there at the time), judicial processes cannot be executed within that palace. The Great Hall of the People is a state building located at the western edge of Tiananmen Square in Beijing.  It is used for legislative and ceremonial activities by the People's Republic of China (PRC) government and the ruling Communist Party of China.  The Great Hall functions as the meeting place for the full sessions of the Chinese parliament, the National People's Congress (NPC), which occurs every year during March along with the national session of the Chinese People's Political Consultative Conference (CPPCC), a political advisory body.  It is also the meeting place of the National Congress of the Communist Party of China, which, since 1982, has occurred once every five years. The Wedding anthem for Princess Anne, HWV 262, This is the day which the Lord hath made, is an anthem for vocal soloists, chorus and orchestra by George Frideric Handel.  It was written for the wedding of Anne, Princess Royal and Prince William of Orange and was first performed during their marriage at the French Chapel in St James's Palace, London, on 14 March 1734.  The music is set to English texts chosen from the biblical books of Psalms, Proverbs and Ecclesiasticus. St. Ermin's Hotel is a four-star central London hotel adjacent to St James's Park underground station, close to Westminster Abbey, Buckingham Palace and the Houses of Parliament.  The Grade II-listed late Victorian building, built as one of the early mansion blocks in the city is thought to be named after an ancient monastery reputed to have occupied the site pre-10th century.  Converted to a hotel in 1896–99, it became during the 1930s, through the Second World War and beyond, a meeting place of the British intelligence services, notably the birthplace of the Special Operations Executive (SOE), and where notorious Cambridge Five double agents Philby and MacLean met their Russian handlers.
Answer: the Accession Council