I'm planning a big Interrail trip this year.

What's the easiest / best / most fun way to meet up with friends for a drink in random cities?

I usually put out a message on social media saying "Anyone in $city fancy a pint tomorrow?"

Is there a way to see which of my friends on Signal / WhatsApp / LinkedIn are in a specific city? Or let them know I'm going to be within 10km of them?

I think I want engineered serendipity. Does that exist?

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