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THUNDERBIRD: the SUCCESS STORY of LINUX! - 6.4M in Donations
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A CalDAV server doesn't do notifications. Its job is to store event definitions, period. Even if it wanted to, it can't interpret the definitions (because it's not its job). For example if you define an event as recurring every week the CalDAV server only holds one copy of the event that says "recurring every week". You need a calendar client to create an instance of the event for every week, and to email participants and so on. So what you really want is either a calendar client app or a groupware solution (which integrates the extra features around a calendar server).
The Google apps are a groupware suit (which happens to have a CalDAV interface, which is incomplete btw because Google likes to keep some features proprietary).
If you've read the Radicale ticket you saw that the contributors agree with me and aren't eager to implement such a feature.
I'm just trying to help you. If you need email notifications you should look at groupware products like NextCloud, not CalDAV servers. But be aware that groupware software often implement some parts of their stack as proprietary or non-standard.