25.2.1808 Nason calls / 8.4.1808 again

No clues. Often an Irish name

1.2.1808 Advertisement, shopman; Hughes &c. / 12.10.1816 coach, w. Hughes (Bath to London) / 3.12.1818 call on Hughes / 17.12.1824 meet, at Keane's, Hughes / 18.9.1827 meet Hughes, Maidstone

Only the last of these five probably different randoms gives any clue. PCC wills for Hughes of Maidstone: Thomas, farmer 1842 / James, milkman 1843 / Charles, gentleman 1848 / William, confectioner 1849

2.4.1808 Harvery calls, bookseller

A rare surname but it did exist. None found in British Book Trades Index or Holdens 1811 directory

26.4.1808 Atkinson adv. at Phillips / 1.5.1808 dines at Philips's / 1.6.1810 adv. (at Phillips? or Surr's? or Godwin's?)

19.1.1808 Mrs Hutton calls

This was the only instance of the name Hutton in Godwin's diary, so it's hard to make any definite identity, but I think it was quite probably Catherine Hutton DNB 1756-1846. She was unmarried but aged 52 so it would be normal if a little old fashioned for Godwin to call her Mrs Hutton. Her novels had not yet been published. Read her DNB article and judge for yourself. There may be among her letters and diaries at Birmingham something which could confirm or deny my guess

8.1.1808 dine at Joseph Johnson's w. Percival

6.1.1808 write to Birket

4.1.1808 call on Hankey

Joseph Hume DNB 1767-1844. Mentioned 540 times in Godwin's diary, only exceeded by Godwin's second wife, his two children, James Marshall, Thomas Holcroft, Charles Lamb, Thomas Turner, David Booth and John Fenwick. The DNB knows very little about him and most of their article concerns a practical joke he and Lamb played on William Hazlitt. He was born 9.4.1764 in Bishopsgate Street, London son of John Hume and Sarah Weatherly, who had been married on 14.3.1758 at St Augustine Watling St, London as bachelor and spinster.

3 Tabarts sup 4.1.1810 / 9.2.1810 call on Tabart (not seen) / 10.2.1810 call on Tabart / 23.6.1810 call on Tabart (not seen) (Guildhall) / 29.6.1810 Guildhall (Tabart) / 31.7.1810 again / 11.8.1810 again / 21.8.1810 again / 11.9.1810 Baptist C H; Tabart / 9.10.1810 Haines calls from Tabart: Baptist's Head; Tabart / 18.12.1810 Tabart calls / 7.4.1820 call on La(dy) Phillips adv. Tabart