Edit events in an external calendar
Enable creating, editing and deleting events in external calendars.
Currently you can only add an external calendar as view only:
https://protonmail.com/support/knowledge-base/calendar-subscribe/
I have a Google cal shared with multiple people (they all use Gcal). We all add and update events and receive notifications. I would like to continue to do all of this but using my proton calendar.

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Locksley commented
Dear god, PLEASE. Why isn't this a normal feature? The Calendar app is already poorly functional compared to Google, but this just takes the cake.
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Matthew Hendricks commented
This is critical for me as well. I Have to use Gmail for work and family calendar sharing so I am stuck using google calendar and can’t use proton. It is not possible for me to just use the proton calendar app to manage external calendars as well as my personal proton calendar.
In a perfect world I can connect to a google /Microsoft account similar to other calendar apps to manage them. Or similarly just for certain calendars add my protonmail account manage a shared calendar like I did with fastmail. It’s the one thing keeping me from using proton full time. And same with my work calendar. It’s a big ask but critical for adopting proton