Merging appointments from different shared calendars

[luckow]

I'm new to groupware tools. In the past I have lived with quite different shared calendars, like nextcloud, google calendar, something from MS Exchange ...

For a few months now, I have migrated my personal calendar to SoGO and also moved some company calendars on different instances to SoGO. I share a nextcloud calendar with my family, and the calendars of various associations are also shared with me.

As a calendar client, I use Thunderbird's built-in calendar with the TbSync plugin. Everything works fine except:
To display my appointments for the different target groups on different instances, I have to copy each entry into each calendar. Guess what? No, I don't do that.

Do you know of any software/help/plugin/workflow to display (my) appointments in each calendar? In the end, I just want to deal with some kind of "master" calendar, let's say my personal SoGO instance, which "copies" all my appointments to the other shared calendars. Ideally, with the option to show or not show the details of the calendar entry. And if I move or delete an entry in the "master" instance ....

Does anyone have any ideas?

[fbartels]

Sadly caldav servers are kind of small islands that leave the display and sync part to the individual clients. You could however use https://github.com/pimutils/vdirsyncer to regularly sync two individual calendars.

[robi]

Perhaps add all calendars to something similar to a gmail account which can display all of them as one and then import into Thunderbird?

[luckow]

@robi ähm (cough). gmail is not an option

[robi]

@luckow wasn't suggesting it was.. it says specifically something similar.