I was planning to focus on only conferences but there’s a large overlap with meetups so there’s an opportunity there. nostr:npub1nxy56ame2gfnfj6fjylzxwq7r94phvgwt037mmvwr60qsqlaseksswlnxl and others made something meetup-like for a Nostr hackathon project a few months ago but I haven’t seen anything about that since. That was before I created the NIP-52 calendar event draft proposal.