Nostrautica is now open source.

It's Nostr-native networking for events. Attendees record a short video, audio, or text intro; AI matchmaking reads that alongside their public Nostr activity and returns a ranked list of people worth meeting, with a plain-language reason for each match. Encrypted DMs let you start talking before the event even starts. Organizers run it with no servers or databases of their own — approval-based access, invite codes, or open registration, their choice.

https://nostrautica.cypherpunk.today/
https://github.com/jooray/nostrautica
Follow at @Nostrautica - event app