Create calendar event from *any* email. (Like Google's "Create event" from an email.)

I organize my life through digital calendars. Many emails trigger the need for an event:
- most emails from companies will be properly formatted to include event information in their headers and email clients (Outlook, Gmail, Evolution) will recognize that and link the message to the associated calendar app (by rendering Add/RSVP buttons and so on)
- many other emails, exchanged with friends and colleagues in a more informal way, will also contain information of "something" that has to be done "some time", "somewhere".

The feature I'm requesting would work for *any* kind of email/event pair: a simple "create event" button the would call for calendar with a "new event" widget open with the email content prefilled in the "notes" (or, instead, linking to the email directly).

would be great to create an invite from an email, with all hte history in the body of the meeting invite

This is not a duplicate of the other request.... the other request is about handling ICS files. This is about "create calendar event from email" (including those that are not already a calendar invite.

...a vendor sends me an email thread with "we'll see you on the 10th at 11:30", but without an .ics or orther calendar invite, then being able to "create a new calendar event from this email" let's me automatically get all the email info into the calendar event body.

The duplicate request at https://protonmail.uservoice.com/forums/932842-proton-calendar/suggestions/43080603-import-ics-invite has more votes - I suggest voting there instead.

Ideally a user would be able to drag the email to the calendar similar to what Outlook allows