CALDAV synchronization
The open web calendar should act as a CAL DAV client and synchronize with the cal dav server (radicale, baikal, sabre, etc) on a regular basis and update the events displayed on the calendar.
The open web calendar should also support encrypted authentication via username / password or other methods.
here is an example from of how to build a caldav client
niccokunzmann / open-web-calendar
Embed a highly customizable web calendar into your website using ICal source links
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