The onl instance of this name in Godwin's diary. But a rare name so probably Samuel Glaister exchange broker of Threadneedle-st (1749-1815 a Quaker) his will PCC 31.3.1815
24.10.1807 Mulready sups; adv. Summons / 31.12.1897 Mulready au soir; adv. Summons / 23.9.1808 Summons calls
Perhaps a friend of William Mulready (DNB 1786-1863) but not found in any artist dictionaries. Possible: SunFire 1814 John Townsend Summons 3 Powell's-place City-rd gent, 1836 of Dalston, esq (Champion 18.12.1836)
29.10.1807 call on Montague, surveyor / 4.11.1807 call on Montague (not seen) / 30.11.1807 call on Montagu, surveyor
SunFire 1781 William Montague, surveyor 13 Bunhill Row
Holdens 1811 James Montague architect & surveyor Morn Post 22.5.1811 appointed surveyor to Blackfriars-bridge, later Surveyor to City of London, his will PCC 6.5.1853
Holdens 1811 William Mountague surveyor 24 Charterhouse-sq (his will PCC 25.4.1843 of Upper Gloucester-st Dorset-sq)
31.10.1807 T(homas) T(urner), from T R D L, sups, seeking Sheridan
In GD website T R D L is underlined as unidentified here, but it clearly meant Theatre Royal Drury Lane as on 21.12.1807 and on 15.9.1818 where GD website correctly explains it in a note
6.9.1807 Carlisles, Buchan & John Flather call / 16.11.1807 Carlisle, Buchan & mrs Topping call / 18.11.1807 Jo(seph) G(odwin) calls, & Buchan (not seen)
The GD website has a person record for Dr Alexander Peter Buchan (DNB 1764-1824), but the above entries are not coded to him. Although calls on the same day could have been quite separate, the fact that Buchan followed Carlisle on the first two entries above suggests that this was Dr Alexander Buchan, a known associate of Anthony Carlisle, and so presumably was the third entry, only two days later.