Ironically, there is no single place, it's decentralised 😂

One meetup posts on X another on nostr:nprofile1qyt8wumn8ghj7un9d3shjtnswf5k6ctv9ehx2aqqypnyupc0uf08dhwwlf2f98qdushv45ypqzf4ql3ymerzyp63ekm65u5nzvk

Actually, if you want to meet other Bitcoiners, maybe consider signing up to Orangepillapp I have made a good local Bitcoin friend from it.

I've also seen them promoted on meetup.com