Add ProtonCalendar event from ProtonMail
Add an event to the calendar from ProtonMail or add an email to a particular date on the ProtonCalendar. Simply, integrating the calendar with the email so that we don't have to have both open in order to coordinate.
You should be able to click something inside of ProtonMail that quickly adds a calendar event. The event should be able to have the email within it ie. the format of the email, hyperlinks still functioning etc
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.