I often receive calendar invitations like "John meeting", where my name is John. When Lesley sends me such a calendar entry I would want to change it to "Lesley+John meeting" and having many John meetings in my calendar is unhelpful.
I understand that it makes some sense that for me the meeting is read only (but overriding that would open up other useful options).
So I ask Proton to allow me copy the event into my calendar, and modify the copy. Thanks in advance.