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Is there a list of these by country?

There is https://meet.hn/, which is a good way to bootstrap (and indeed, how I bootstrapped this meetup)

Hey I'm already on the site! Used to have the link with my city on my profile.

How does one bootstrap a meet from this? Just explore the map around my location and try to get in contact with people somehow?

You pray that people either have their contact details in their HN profile or that they attached some social networks to their meet.hn post.

Then you trawl through your set of qualified leads :)