Syncronizing and sharing calendar events (event)

Calendars hold events and tasks (tasks, a.k.a. todo items, are events without time or date assigned).

Each user can create private calendars tied to their personal account.

Shared calendars can be created for groups of users.

Private and shared calendars can be exported as read-only calendar files e.g. for publishing on a website.

Technically, private and shared calendars is a CalDAV service using Radicale, and public calendars are iCalendar files.

Invites

Triggering and tracking (semi-)automated invitations to events (i.e. CalDAV extensions iTIP and iMIP) is currently not supported.