Repeating Events and To Dos
Repeating events and to dos reoccur at regular intervals (such as every day, every week, or every month).
To make an event or to do repeat, tap Repeat in its Event Details view and then tap a repeat interval: None, Daily, Weekly, Monthly, or Yearly.
Note: Unlike the Mac version of BusyCal, the iOS version does not support custom repeats. However, custom repeats set on your Mac do sync correctly to BusyCal for iOS.