You entered a recurring event with no end date, and then things changed. Now you need to impose an end date (or make the end date earlier than the original one you set), deleting events in the series that occur after that date, without affecting the events that occur before that date.
Set a new end date.
- Display the calendar and open the recurring event for editing.
- In the event form, if no end date is set, under Repeats, click the No End Date check box to clear it.
- When the display refreshes, select a new end date.
- For Change, select This and future events in the repeating pattern, and then click OK.