Would you have a meetup of <insert newspaper here> readers? That's the breadth of topics covered by HN, and I just don't see it being unifying enough.
A HN pub crawl would be cool, you want diversity to keep things interesting while using HN as a broadly similar filter would help to ensure there are some overlapping interests.
More targeted groups are good for learning or specific activities.
People meet and play/jam/work/demo new music.
Focus on anything audio/software related that makes music.
I did become friends with people in my geographical region who read HN. It is a unifying aspect - non-American who reads HN.
Maybe a VC can get drunk and pitch out the strangest idea possible. I know I'm going to build my 3 hour prototype in Flutter, what about you.
You want to go get pizza some night and talk about the failing of cryptocurrency? I'm your guy! ...presuming you're within, say, 30 minutes of me (halfway between Lexington KY and Knoxville TN)
I might also be "your guy" if you wanted to discuss theological implications of a cashless society
Or if you want to talk about the pros and cons of an all- (or mostly-) electric vehicle fleet in a given country
Or any of myriad other topics
But if you're not near[ish] me ...I'm not your [in-person] guy
I'd love to get together the next time I'm in Sacramento or Seattle or Chicago or Las Vegas or Miami or any of a thousand other places - but carving out time in my life for people not nearby? It's just not a priority
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"Render unto Caesar" being a bit confusing for such a society perhaps?
This discussion could probably also extend to investment portfolios - have you actually "increased" when the value of your investments go up? Or do you only consider any "increase" when it is realized from the virtual to the real?
Saturday, X day of Y month, in Such and Such Park, near West parking lot, 11:30 a.m. BYO everything.
It doesn't have to be a tech conference with presentations and keynote speakers.
I think quarterly would be perfect. Plus in Michigan you could bypass the worst of winter and not have the worry of a blizzard wiping out all your plans.