What I use my non nostr calendar for as it could be applicable here, is contacts and location events connected with the calendar event, so when I click on it gives me the most info in the most compact way and redirect if applicable (irl it is to phone number and address on a map). In this case could be npub/s list(or link to such) along with the public physical or note location to event (i.e. nostrasia/unconference/bitcoin meeting/zapathon/nest/zap stream/get outside ffs reminder etc) along with the note link that could fit, maybe with a shortner).