Ok. The way I’m set up with my partner is to have two calendars, one on Nextcloud (me) and one on Google Calendar (my partner). We subscribe to each others calendars, and I’m also formatting it the same so it appears to be one. However, we cannot edit each others entries, but for our use case that is not needed, we just need to share certain events between us. So while this is not Proton, I believe the same is doable there.
I can see how this is not a very practical with multiple people (but potentially doable, it has been set-and-forget in my case), and if you need the ability to edit each others entries, then it is a non-starter.
I have shared calendars with family and friends that I need to keep using.
Ok. The way I’m set up with my partner is to have two calendars, one on Nextcloud (me) and one on Google Calendar (my partner). We subscribe to each others calendars, and I’m also formatting it the same so it appears to be one. However, we cannot edit each others entries, but for our use case that is not needed, we just need to share certain events between us. So while this is not Proton, I believe the same is doable there.
I can see how this is not a very practical with multiple people (but potentially doable, it has been set-and-forget in my case), and if you need the ability to edit each others entries, then it is a non-starter.
Then your plan is kinda flawed from the start, eh?