Almost every person of consequence in Highbury seems to have a tag-along. Hence, when Mr. Knightley invites people over to Donwell, they all insist on bringing their "proteges" by default.
First, there is Mrs. Elton. Even after Mr. Knightley's insistence that he would manage his invitations himself until "Mrs. Knightley" came into being, Mrs. Elton insists that "Well, I shall bring Jane with me -- Jane and her aunt. The rest I leave to you." There is no response such ill-breeding.
Mr. Woodhouse's response is to say ". He could not see any objection at all to his, and Emma's, and Harriet's, going there some very fine morning.
This is not to say that Mr. Knightley would not have invited Miss Bates or Jane Fairfax or Harriet to Donwell, but give the man a chance to do it himself!
Finally, Mr. Weston unasked, promised to get Frank over to join them, if possible; a proof of approbation and gratitude which could have been dispensed with. Mr. Knightley. Mr. Knightley was then obliged to say that he should be glad to see him...
Poor Mr. Knightley is forced to give an invitation he does not wish to. These Highburians are simply too demanding! Lol
All quote from Ch. 42.