The documentation of the API for pushing events, or pulling, individual events is much the same as it was (for now - it may still change in the next 4 weeks).
> My idea is to install a calDav server (like Baikal or Radicale), a
> calDav web client (https://www.inf-it.com/infcloud/ or agendav.org), and
> My idea is to install a calDav server and
> a daemon to import periodically the activities from whatever form they
> come to a calendar format. This would map radar events to calendar
> events and potentially radar groups to cardDAV contacts.