9.3.1794 at Wimbledon (Tooke's) with Joyce / 15.4.1794 Joyce, Jones, Stanhope call / 2.6.1795 at Reveley's adv Jones / 8.10.1795 at Thelwall's adv Jones T C(k)d / 18.10.1795 at Holcroft's adv Ritson, H Richter, Sharp, C(ooper) &Jones / 1.3.1796 Godwin calls on E Mansel, Cooper, Jones / 4.3.1796 Cooper & Jones dine at Godwin's / 7.4.1796 with Northcote, talk of T Jones / 16.4.1796 at Perry's, D Jones / 17.7.1796 at Melton (Norfolk) with Harwood & Vickery adv David Jones / 18.6.1797 sup at Jones's, Cambridge with Woodhouse / 10.5.1798 Sadler's Wells, with Jones / 12.6.1798 adv at Parr's / 23.6.1798 theatre, with Jones / 19.7.1798 JGJones calls / 4.9.1798 at Joseph Johnson's / 16.1.1799 & 15.6.1799 Jones calls / 7.8.1799 Gale Jones calls / 25.4.1801 adv D Jones at theatre / 9.11.1801 D Jones at Joyce's with Barbaulds / 31.7.1802 JGJones adv at theatre / 14.4.1804 Jones at Harwood's (with 3 Coopers) / 4.5.1805 Jones at Nicholson's / 10.8.1805 call on Jones, copper plate printer / 23.12.1805 call on Jones / 9.3.1806 B Jones at Wimbledon (Tooke's) / 13.7.1806 mrs Jones at Nicholson's / 25.11.1809 call Ld Mayor's Ct, Jones / 27.12.1813 seek Jones, Size Lane / 28.12.1813 call on Jones / 4.1.1814 Jones, Size Lane calls / 15.7.1814 M & F Jones call for Miss White / 7.6.1821 Boo, Twana & Jones at Hume's / 8.6.1821 Jones (Millenium Hall) calls / 26.11.1821 Boo Twana & Jones call / 16.1.1827 mrs Jones at Aldis's / 5.2.1827 dine at Ch Jones's with Aldis / 9.2.1827 call on mrs Jones / 16.8.1827 mrs Jones at Aldis's / 25.4.1828 sup C Jones's with Aldis / 14.5.1828 call on C Jones / 10.10.1928 sup at C Jones's with Kennies / 13.10.1828 mrs C Jones at Kenney's / 16.1.1829 mrs Jones at Aldis's / 12.5.1829 dine at C Jones's with Aldis & T Jones / 28.5.1829 call on C Jones / 2.6.1829 Aldis & C Jones call / 9.4.1830 call on mrs Jones / 7.5.1830 C Jones at mrs Maugham's / 3.6.1830 Aldis & C Jones at mrs Wood's / 11.7.1830 mesd(ames) Davies, Hamilton, mr Jones at E Leigh's / 9.9.1830 mesd(ames) Leighs, Davies, Hamilton & Jones at tea / 14.10.1830 call on C Jones / 4.1.1831 adv Britton & Jones at Brayley's / 7.1.1831 mes(dames) Jones & Maugham call / 10.1.1831 dine at C Jones's / 14.1.1831 again / 29.3.1831 call on C Jones / 15.6.1831 Griffith Jones calls / 29.12.1831 Jacob & mrs Jones call / 1.1.1832 C Jones at mrs Wood's / 2.1.1832 dine at C Jones's / 6.1.1832 call on C Jones / 7.2.1832 C Jones at Aldis's / 14.3.1832 sup at Jacob's with miss Jones / 26.6.1832 C Jones at mrs Wood's / 11.7.1832 mrs Jones at miss Crumpe's / 18.11.1832 C Jones at mrs Wood's / 4.1.1833 dine at C Jones's / 26.1.1833 C Jones at Aldis's / 15.3.1833 C Jones at mrs Wood's / 2.1.1834 J Jones au soir / 25.5.1834 W..... Jones at Babbage's / 7.6.1834 Jones at Babbage's / 25.12.1834 Jones at Wood's / 31.12.1834 J Jones calls / 11.1.1835 again / 12.1.1835 J Jones sups / 13.1.1835 write to R S for Jones / 6.2.1835 G Jones (actor) calls / 30.3.1835 G Jones calls / 1.4.1835 G Jones at Sass's / 12.4.1835 G Jones calls / 21.4.1835 again / 4.5.1835 G Jones at (RA) exhibition / 5.5.1835 G Jones calls / 16.5.1835 again / 19.5.1835 again / 28.5.1835 Jones at Gaskel's / 5.7.1835 Col Jones calls / 6.7.1835 G Jones calls / 26.7.1835 again / 10.9.1835 again / 6.10.1835 again / 15.10.1835 Victoria Theatre, Hamlet, G Jones / 31.10.1835 G Jones calls / 25.12.1835 G Jones at mrs Wood's / 19.2.1836 mrs Kinchant & Jones sup
I've included above all the Jones entries up to 1820 that don't seem to me to have been clearly the family of Louisa Jones (her sister Margaret & brother Richard) or the Mr & Mrs Jones friends of the Webbs in 1790-2 who may perhaps have been Louisa's parents too. There are two plain Jones entries above, 10.5.1798 & 23.6.1798 which may well refer to Louisa Jones as she was then living in Godwin's home and they were both theatre visits. The other plain Jones entries were not likely to have been all one person, Jones being of course a very common name, though some of them may have referred to Margaret Jones and some of them may have been John Gale Jones or D Jones or T Jones who got clearly identified on other dates. In 1794 there were two entries associated with Jeremiah Joyce, and in the winter of 1795/6 there were three associated with Cooper
In Godwin's 1796 list for 1795 the GD website has "Jones JGGodwin" but a close look at the original shows this should be "JGJones Galway" . Galway and the JG were both inserted above before it was all crossed out, so Jones originally came between Dahlberg and Carlisle. D'Ahlberg appeared in the diary on 2.11.1795 and Carlisle first on 6.11.1795 and there was no Jones entry between them, and Galway appeared on 14.10.1795, but the nearest Jones entries were 8.10.1795 at Thelwall's and 18.10.1795 at Holcroft's. The entry at Thelwall's is transcribed in GD website as Jones T CKd but a closer look shows this should be Jones TCRd which probably means Tottenham Court Road. J G Jones surgeon, subscribed to Winterbotham's America in 1795 from Hampstead Rd but in Thale, Selections from the Papers of the LCS, p170, 176 & 178 in reports from the spy Groves on meetings of Div 2 of the LCS in May & June 1794 J G Jones was referred to as Jones of Tottenham Court Road, though I can find no other reference to his address having been there. The entries with the actor Thomas Cooper seem likely to be Gale Jones, whose oratory was said to be dramatic and who attended Holcroft's play in between those dates.
Jones at Cambridge was likely Thomas Jones PCC 1756-1807 of Trinity College Cambridge, a good friend of Samuel Parr's who defended William Frend at Cambridge, and he may well have been the Jones of 12.6.1798 at Parr's, and could have been some of the other plain Jones entries, such as the ones with Joyce, though as a Cambridge tutor he might not have spent a lot of time in London. The Woodhouse with Jones at Cambridge may have been the mathematician Robert Woodhouse who got his BA that year, 1797, and Thomas Jones was a mathematics tutor, though the editorial notes to the person record for Robert Woodhouse on the GD website suggest that it was in fact his father, also Robert. The T Jones talked of with Northcote on 7.4.1796 is perhaps more likely to have been the artist Thomas Jones DNB 1742-1803 who might also have been the Jones at Reveley's. The D Jones of 16.4.1796, 25.4.1801 and 9.11.1801 (but perhaps not the David Jones of 17.7.1796 in Norfolk) is likely to have been David Jones DNB 1765-1816 who was enrolled at Lincolns Inn in 1795 and called to the bar in 1800.
For Jones copperplate printer 1805 I've found no Jones with that exact description but printers in British Book Trades Index were Hannah Jones 74 Tooley St Southwark 1799-1811, Thomas Jones 6 Little Chapel St Westminster 1804-1810, Thomas Jones 138 Fetter Lane died 7.4.1806, William & Samuel Jones of 30 Lower Holborn to 1830 (& see Thomas Jones DNB 1775-1832) and printers in Holdens 1811 were Thomas Jones 24 Wardour St and William Jones 56 Chiswell St
Jones of Size Lane 1813 & 1814 was David Jones attorney 15 Size Lane Bucklersbury his will PCC 1841
Jones (Millenium Hall) who called in 1821 is intriguing. Millenium Hall was a popular utopian novel about a female community published in 1762 (see Sarah Scott DNB 1720-1796). See also Isabella King DNB 1772-1845 whose project inspired by that novel (though not using the name) was moving from Bath to Bristol in 1821. The only use of the name Millenium Hall for an actual place I have found was for a plantation in Jamaica.
For G Jones, actor of 1835 see Count Joannes (George Jones 1810-1879) in Bordman's Oxford Companion to American Theatre and see Morning Post 16.10.1835 for a review of his first performance, in competition with Charles Kemble's Hamlet at Drury Lane, and a few days later Macready played Hamlet at Drury Lane, Kemble at Covent Garden, and G Jones at the Victoria