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I like the suggestion of vetting people, in a way I (or whoever wants to do the same) have to do a threat modelling session and try to come up with ways to mitigate the risks.
I doubt the type of crime is very sophisticated where they are reading bitcoin forums looking for targets? Is it just migrants stabbing people in the street?
Well, if it's open and someone is suspected to be wealthy in Bitcoin, they could give/sell that info to someone who could steal, ransom, etc.
Are you worried about an attack on your home/family, or violence occurring at the meetup?
Mostly myself, home, and family.
Great answer! Thanks for contributing to the discussion @Enemy_of_the_state