Combine calendars from Teams

AJValentin I don't think it is possible using SharePoint OOTB web parts.

Using OOTB functionality, all you can do is: create a modern SharePoint page, add 4 Group Calendar web parts on single page & show events from 4 teams in 4 web parts.

However, you can merge items from multiple calendars inside outlook, check below documentations:

1. Merge items from multiple calendars
2. View multiple calendars at the same time

Now, you just need to find a way to add these merged calendars inside teams or SharePoint.

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