Atty 29.12.1799 at Lanesborough's
James Atty of Whitby (sailmaker Sun Fire 1781) his will PCC 1814 married Hannah dau of Robert Middleton in 1768. They had three sons / James 1768-1816 married Catherine sister of Rev Robert Hall / Robert Middleton 1770-1833 of 55 Devonshire St, St Marylebone Land Tax 1798, who married 24.11.1807 Margaret Ann Lucy Willes / and George 1772-1797 unmarried Alum Cantab. The presence of miss Middleton at the same dinner makes the identification more likely
Gore 29.12.1799 at Lanesborough's / 19.1.1800 again / 21.1.1800 Goire at John King's
Milton 24.12.1799 at Lanesborough's / 19.1.1800 again
Landaff 29.12.1799 at Lanesborough's
The GD website has coded this to Richard Watson the Bishop of Llandaff but I think more likely it was Francis Mathew, ist Earl of Llandaff (Dict irish Biography 1738-1806). His son Francis James (Viscount Matthew) had married 10.7.1797 Gertrude La Touche,acousin of Elizabeth LaTouche who had married 17.1.1781 Robert Herbert Butler, 3rd earl of Lanesborough and Lady Lanesborough's eldest son
Laval 29.12.1799 at Lanesborough's / 19.1.1800 again
Perhaps Anne Alexandre &c, duc de Laval, 1747-1817 will PCC 1817 marshal of France 1783, who was certainly in England in August 1799 as the Oracle of 14.8.1799 reported his departure for Switzerland with his two sons, one of whom, Anne Pierre Adrien 1767-1837, succeeded him as duke and would have been styled marquis de Laval at the time (Hoefer, Nouvelle Biographie Generale). There are biographies of father and son in Adolphe Robert's Dictionnaire des Parlementaires Francais which I haven't yet seen
Lanesborough's 29.12.1799 / 19.1.1800 again / 12.6.1802 meet Lanesborough,SM, EBD / 3.3.1807 King, L Lanesborough at mrs Hippisley's ? 8.3.1807 dine at Plunket's, w. King, L Lk
mrs Newnham 26.10.1799 at John King's / 17.11.1799 again
miss R 24.12.1799 at mrs Robinson's
Surely Mary Elizabeth Robinson who has a person record in GD website
T Woodhouse 20.12.1799 at Opie's / 17.1.1800 Tho Woodhouse at Opie's / 26.6.1800 again
Presumably John Thomas Woodhouse 1780-1845 fellow of Caius College, Cambridge and brother of Robert Woodhouse DNB 1773-1827 (see Jones)
call on mrs Coleridge 20.12.1799
Presumably Sara nee Fricker 1770-1845 see Samuel Taylor Coleridge DNB 1772-1834. The Coleridges dined at Godwin's on Christmas Day, five days later