1898.11.05 Lasker Simul 21b, London (1898) (+21=0-0)
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Perhaps twenty-two members, with a consulting pair, for 21 games?
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Yesterday Mr. Lasker, the champion, made a record at the Ladies' Chess club in Regent-street, when he played 21 members of the club simultaneously, and scored at every board.
Source: London <Lloyd's Weekly Newspaper>, 1898.11.06, p23

Mr. E. Lasker, chess champion of the world, is on a short playing tour in England, and gave his first exhibition on Saturday at the Ladies' Chess Club, 168, Regent-street. The champion played simultaneously against twenty-two of the members, the team opposed to him including most of the strong players of the club. In the course of three hours' play Lasker beat his opponents one by one and won every game.
Source: London <Pall Mall Gazette>, 1898.11.07, p9

Mr. Lasker gave his first public performance since his return to London on Saturday afternoon at the Ladies' Chess Club, 168, Regent-street. He played 22 of the members simultaneously, and though he won every game, he declared afterwards in returning thanks for the hearty welcome accorded him that he had found the ladies very tenacious in their play, and he saw a marked improvement in the combinative style, whcih he much admired.
Source: London <Morning Post>, 1898.11.08, p3

Mr. Lasker on Saturday played twenty-one games simultaneously at the Ladies' Chess Club, and was ungallant enough to win all the games.
Source: London <Westminster Gazette>, 1898.11.12, p3

Mr. Lasker made a successful re-appearance on Saturday, Nov. 5th, after his long absence abroad, by encountering twenty-two members of the Ladies' Chess Club simultaneously at their rooms in Regent-street. Among the ladies were such strong players as Mrs. Fagan, Mrs. Anderson, Miss Fox, Mrs. Bonnefin, and others scarcely less accomplished.
Source: London <Illustrated Sporting and Dramatic News>, 1898.11.19, p422
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Some Members in 1898:
Mrs. Anderson
Mrs. Banting
Mrs. Bonnefin
Mrs. Bowles
Mrs. Burgess
Mrs. T. Chapman
Mrs. Craig
Mrs. Edwards
Miss M. Edwards
Miss Eschwege
Miss Eyre
Mrs. Fagan
Miss Field
Miss Finn
Miss Fox
Mrs. Holmes
Miss Hooke
Mrs. Hookins
Mrs. Hudson
Mrs. Hussey
Mrs. E. S. James
Miss T. John
Mrs. Joughing
Miss Kennedy
Mrs. Kenrick
Mrs. Lewis
Mrs. Ludlam
Mrs. Morbey
Mrs. Morley
Mrs. Naumann
Mrs. Newnes
Mrs. Nimmo
Mrs. Oakley
Mrs. Parry-Crooke
Miss Prothero
Mrs. Robbins
Miss Robertson
Mrs. Rooper
Mrs. Rumboll
Lady Thomas
Mrs. Vivian
Miss Wilkins
Sources:
London <Pall Mall Gazette>, 1898.11.08, p9
London <Pall Mall Gazette>, 1898.11.22, p9
London <Illustrated Sporting and Dramatic News>, 1898.11.19, p422
London <Morning Post>, 1898.11.21, p3
London <Streatham News>, 1898.12.03. p7
<British Chess Magazine>, 1898, pp254,292,412