20.4.1789 at Brand Hollis' Signora Marchetti. In Godwin's 1796 list (crossed out) for 1788 as Marchetti, also in 1794 version as Marquetti

Signora Marchetti (fl1773-1791 Highfill, Burnim and Langhans) opera singer

Roebuck 20.4.1789 at Brand Hollis'

John Roebuck DNB 1718-94 seems likely

21.4.1789 at Brand Hollis' / 21.4.1795 at Anderson's / 24.1.1802 mrs Graham at Nicholson's / 3.10.1802 Graham calls / 8.10.1802 adv at museum / 19.11 1802 dines / 30.11.1806 call on Graham, with Wroughton / 8.3.1807 again / 4.10.1807 Grahams at North's / 17.12.1807 Graham at D(rury) L(ane)  / 18.12.1807 Graham & Wroughton adv at theatre / 21.12.1807 call o Wroughton & Grahm T R D L / 13.8.1808 Graham calls / 16.8.1808 adv at supper / 18.8.1808 meet Graham / 19.8.1808 calls / 19.7.1810 Graham of Berwk calls / 21.8.1811 M(ary) J(ane) calls on Graham / 24.9.1811 seek Graham / 25.9

28.4.1789 Majendie at T Hollis and 5.5.1789.

Lewis Majendie 1756-1833, younger brother of Henry William Majendie, bishop of Bangor DNB 1754-1830, married 1783 at St Marylebone Elizabeth Hoghton, granddaughter of Timothy Hollis' sister Elizabeth who married William Ashurst (d 1735), their daughter Elizabeth married Sir Henry Hoghton and died in childbed 1761, her daughter Elizabeth survived and married Lewis Majendie. Codicil to Timothy Hollis's will dated 16.5.85 mentions his niece Elizabeth Majendie Hoghton

23.3.1789 (mes) Thomas at Miss Williams' / miss T 31.5.1795 at Foulkes / Thomas 11.4.1796 and 15.5.1796 at Mrs Robinson's / 21.7.1796 at John Taylor's / 28.11.1796 adv at Mrs Inchbald's / 5.2.1798 at John King's / 19.7.1800 Thomas's at Lefanu's in Ireland / 3.7.1801 call on Thomas L S / 5.7.1801 again / 22.12.1802 miss Thomas's call / 4.1.1803 miss Thomas calls / 11.8.1807 call on Thomas, S T, / 11.5.1812, 7.2.1813, 30.5.1813 & 14.7.1813 all adv at Francis Place's / 2.11.1814 Thomas au soir, then none till 1831.

Mansel 31.3.1789 at Timothy Hollis' & 16.3.1790, 29.6.1790, and 28.9.1790 there.

Crompton 16.3.1789 at miss Williams'.

31.3.1789 Chelsum at T Hollis' and 2.2.1790 there.

Rev James Chelsum DNB 1738-1801 though very much a Church of England man, was a member in 1788 for the Society for Abolition of the Slave Trade so would have had something in common with Hollis. The name Chelsum is very rare which adds to positive identification

 

23.3.1789 (mes) Alexander at Miss Williams'.

Letters of Joanna Baillie online mentions two spinster sisters that the Baillie sisters had known many years, whose brother was Chief Baron Alexander (18.5.1755 - 20.6.1842). This could be one or both of Christian died unmarried 25.2.1846 in 84th year or Jane died unmarried 7.2.1843 at Dover in 77th year, both left PCC wills

 

23.3.1789 Darby at Miss Williams'.

1786 subscribers to HMWilliams poems Harry Darby Esq Grange Hill Essex; Mr John Darby Hatfield Herts; Mr Edmund Darby. See PCC wills of Mary Darby 1815, John Darby surgeon of Hatfield 1823, and Edmund Darby of Aston House, Herts 1831. Not at all clear which of these (or one of several other possible) Darbys