Entries can be copied when you want to create an entry with the same details as an existing one.
1. Go to the event you wish to copy.
2. Tap the three dots in the top right-hand corner "・・・" then select "Copy".
3. Select the calendar to which you want to copy the event.
4. Make any edits to reflect entry changes, and tap the save(✓) button.
[Copy to multiple dates] Available from iOS 7.8.0/Android 7.6.0
1. Go to the event you wish to copy.
2. Tap the three dots in the top right-hand corner "・・・" then select "Copy to multiple dates".
3. Choose the days from the calendar (You can select up to 30 days)
4. Tap "Copy event to the selected dates"