I worked (has been a while) on a proof-of-concept inspired by nostr:npub1arkn0xxxll4llgy9qxkrncn3vc4l69s0dz8ef3zadykcwe7ax3dqrrh43w how to check-in on a specific location (a Foursquare feature):
https://shares.sebastix.dev/0o4J6pM1.mp4
- These checkin events are kind 13811
- Location events are kind 37515 requested from wss://cyberspace.nostr1.com
You can find it on https://nuxstr.nostrver.se/ under Places
For Nostr we need that dataset to be migrated to events, but there is no consensus yet on how location data is fitted into events AFAIK. There are multiple NIPs out there, but none is merged or is leading the pack.