This is the seventh one and so far we've had zero incidents which made the woman in the group feel uncomfortable.

That is incorrect. Things have happened in this meetup too on OCT 9.Quoting from " post meetup update oct 9 no more lonely friends" thread.

" I saw the same guy who spammed dick pics to everyone on the TG group going about and mingling with people. However, a friend did recognise him and warned few people before leaving the meet."

If such a person stalks a woman home, or continues harassing them on TG , what steps were taken to prevent such things?

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I had thought that as the organizer, you would have been aware of this issue or seen this comment on your post.