Who are the "hundreds of people" who visit the Manette's on Sundays in A Tale of Two Cities?

Well, that's true; it is a rather exaggerated description of all the men who want to visit Miss Pross's Ladybird.  But that's only half of what's happening with the hundreds of people.  Remember, their house "was a wonderful corner for echoes."  And the sounds of hundreds of footsteps is a constant theme throughout the novel and certainly in this house.  The echoing footsteps were a foreshadowing of what was to come--the sound of a Revolution.  This constant motif is part of the impending  "giant crowd of people, with its rush and roar, bearing down upon them."