I like to imagine it as a fake Android CalDAV Client that doesn’t subscribe to a CalDav Server, but instead to a directory that you define. The UI is also based on DAVx5. It doesn’t store iCal-files, but Fossify Calendar allows export of events in iCal.
You can use DecSync!
synchronizes RSS, contacts, calendars, tasks and more without requiring a server
It is quiet easy to set up for Android with DecSync CC
With any Calendar App you like. I enjoy Fossify Calendar.
For PC you can install DecSync-Plugin for Radicale. And then import your Calender’s to any CalDav compatible program.
Why is this not linked in the sidebar?
edit: No matter what one thinks about the privacy aspects of Signal: If its an official discussion group of this community it should be in the sidebar - just like the Discord group. I therefore assume it’s unofficial or maybe not even related to this comunity?