This is a pretty major omission as far as I’m concerned.. It’s a shame we are being asked to vote for what is a pretty obviously necessary feature. Calendars are pretty useless until this is resolved.

Is this planned? It would make all the difference in the world to me

That's super important and I'm waiting for the update. If it won't happen, I may leave for another solution...

Spark did it - I trust Missive can as well

Please make it happen!

This would be a great addition and would really make Missive more valuable to my company!

A must if you are using anything other than Google or Outlook for emails

I'm new to Missive, and am tremendously impressed.

Like others here, I use iCloud calendar. My iCloud email address is on a custom domain: firstname@lastname.com

I do have an old Gmail account, but I do not want to RSVP with that email address: firstnamelastname@gmail.com

I wanted to share my workaround. It is possible to create a Google account with a non-Google email address. I simply created a new Google account with my firstname@lastname.com custom email, and then had a Google Calendar linked to the same email.

In this way, I'll be able to use iCloud for mail, and Google for Calendar, on the same email address.