Calendar is very important to me. Recently Google killed inbox, which handled all my agenda, and I am looking for an alternative.
This is the right time to move to protonmail, as gmail Just removed the app k used the most. I will reorganize my things in a privacy friendly environment.
Well, I guess you should just wait for ProtonMail then. But if you're really interested in potential alternatives that are privacy friendly, probably while waiting for ProtonMail's calendar, probably check this out:
https://www.privacytools.io/software/calendar-contacts/ - I haven't used any of those, so yea.
The site itself(privacytools.io) is great, too. Mainly for privacy-focused software recommendations and stuff. Best of luck.
And you can donate to them using bitcoin if you're feeling generous.
I'm not affiliated with them just to be clear.