Calendar

Created calendars and subscribed feeds from macOS Calendar, read as a periodic snapshot. No secret — access is a macOS permission, requested explicitly:

memcal ical setup
memcal ical status

Partiful invitations are recognized through Apple Calendar data when you subscribe to the Partiful calendar. Memcal keeps their RSVP links and distinguishes an unanswered invitation (opportunity, mentioned) from a confirmed plan. See Events & series.

Publishing back out — confirmed memcal events to a dedicated Apple Calendar, due tasks to Apple Reminders — is a separate opt-in and off by default. See Publishing.