If you are working in an Event App, you can make the event repeating (some call it recurring).
You set an event as repeating after you create it. Click the repeat icon to the right of the date and time for the event, then choose when you'd like the event to repeat.
Only the next occurring event will be created, but you will still see placeholders for future repeating events in your calendar. The placeholder events are shown with a dotted border.