To copy an event press the copy button in event details.
You have 2 options: single and multi copy.
To make one copy and possibly edit one or 2 details, choose single copy.
To copy an event to multiple days, e.g. to quickly enter your shift roster, select multi copy.
In multi copy mode you can select the days to which the event should be copied in either week or month view.
After confirmation, there is an undo option offered.