So I was trying to copy a single occurence of a series to a new calendar by
dragging it and got this message -

"Single occurrences of an appointment series cannot be moved to another
calendar. You must move the original meeting or move a copy of the single
occurrence. "

So it IS possible to make a copy of one single occurence? How? Copy is
disabled when I open the occurence and ctrl + dragging just ignores me. Right
click + drag + select copy also ignores me.

Surely if it tells me to do this the feature HAS to exist? This would solve
my nagging recurrence issues if only I could find the method!