How to Set up a Repeating Event on the iPhone Calendar
The default repetition setting for a new event on the iPhone calendar is Never. If your event is one-time only, skip this. For yearly events like an anniversary, or weekly events, such as a tennis lesson, the repeat function is handy.
You only have to enter the information once and Calendar takes care of the rest, saving you the hassle of both remembering to re-enter the event the next time it's coming around and of re-typing the information. Here's how:
Tap Repeat on the event you created.
If it's an event that you created previously, open that event and tap Edit in the upper right corner.
Choose the frequency with which you want the event to repeat.
You return to the Add Event screen but another field is added under Repeat: the End Repeat field.
Never is the default, which you probably want to leave for events such as anniversaries. Your tennis lesson may be seasonal, so tap the End Repeat field and then tap On Date.
Use the rotor to choose the date the event ends.
Tap Add Event or Edit in the upper left corner to return to the event screen.
If you use Calendar on a Mac, you find more flexibility for creating complicated repeating events, which then sync to your iPhone.