Definitely nostr:npub15xd2mmjnh3caykh77djsv73e0zkrp42jp5mwerx8f4m6su40wdvss7t3l3. 

It's basically:
Meetup[dot]com + Instagram + Trip Advisor + Nostr

It's still a WIP, but when it's done, it'll connect Bitcoiners and Nostriches in both cyberspace and meatspace.

https://youtu.be/p28dmMfAt3M