If you have an event which occurs at the same time of day on a regular interval, you can create a repeating event.
Create the date and times of the first event. The end date should be the end date of the first event (as opposed to the end date of the series).
Then enable the Repeat checkbox to set up the interval. The interval is where you will set up the last day of the series.
Fill in the rest of the fields as normal.