Affinity-Match Recommender for IRL Meetups

Open-source recommender system that matches users by shared niche interests and optimizes for sustained in-person meet-ups, replacing scroll-driven feeds with connection-driven recommendations.

Meetup, Bumble BFF, Lex partially address this but optimize for broad discovery, not narrow-interest matching with offline conversion. No widely-deployed system whose loss function is "did the people you matched actually become friends in real life."