I would argue that it's only 80% done :)
It's still not possible to edit the event once participants are in, so any changes still need to be done in the Web app.

thank you!!! Keep up the great work!

Thank you! Game changing feature that was sorely needed.

Thank you!

I can't understand why after 4 years of this post we still don't have this feature. It's for me the only reason why proton calendar is still not a viable solution for people that use iOS.

This is the only reason why my wife does not use proton calendar yet! Please make this happen! :)

Once I invite a participant through the web app, I can no longer edit the event through the iOS app. Why so complicated? I invite people to events all the time. Isn’t this considered base-line v1.0 functionality?

Don't know why this isn't implemented yet.

This IMHO is critical. When i helped my wife switch from Outlook to Proton she was dissapointed how such a basic feature is available on the Android Version but not on IOS Version. Imagine having to remember to check your PC in the evening just to invite people to a calendar entry.

I don't see this option on the web either ......

Creating calendar items on iOS mobile app is fine, but I seriously need to be able to add participants from mobile, as well.

As it is, I have to create the item in the app then go to the web app to add any participants. This is very far from user friendly.

I was a little disappointed, having moved over from Gsuite, setting Proton up, including calendar, and then finding out that you can't invite participants for a simple event, when using calendar on IOS.
Why is that not possible? Security issues? I don't get it. To me, it's critical to share and include people for your events, otherwise it's useless.

Thank you for making this request. Perhaps spoiled with corporate tools, I originally assumed this was going to be a basic functionality. Is this feature on the roadmap?

Yes. I would have though this would have been an MVP feature!

What is the timeline for this? We may have to go to another service if this doesn’t get added for iOS.

Please implement adding participants to events for iOS ASAP. This is a major barrier for adoption.

This is really critical. I need the ability to enter a new event from my iPhone in ProtonCalendar and invite my spouse (add participants).

Thankful for the Proton Calendar for iOS. This is really a great step forward. But this app only has a fraction of it's utility as we cannot invite others or add participants to an event. I assume this is an encryption issue since we have this feature on the web version. We need this feature in the iOS Calendar app!

You say it's available. How? I don't see it.

We've been waiting for a while for anything around this, and I don't see a planned roadmap that is readily available for constant consumption QoQ or YoY.

Below is what I did to ensure my family transferred away from Google Calendars while waiting for Proton to catch up.

I hosted a nextcloud instance myself and installed the calendar extension to start. Proton bridge v2 is available to use to update any personal calendar syncing to the Proton cloud service (specifically calendar here), and according to the roadmap update from the CTO, v3 is planned for sometime before xmas.... We'll see if that becomes a reality or not. From there, I allowed my family members full edit to my calendar in nextcloud and then synced all settings to their mobile device using DAVx5.

This solution allows us to fully decouple from Google calendar while still having the benefits of Proton mail. Hopefully this helps others out there that are looking for a solution.

This is all done with a raspi 4 and functions fantastic for now.

@protonPMs, please update us on the progress of this item.