You can edit a repeating event without overwriting all events in the repeating event series. To do this turn on the Smart Update option:
Go to Admin Menu > under Calendar Settings section > Calendar Options > Advanced Options Tab >
Check "Enable Smart Update when editing repeating events" > Save
This "Smart Update" option is helpful for organizations that use repeating events for scheduling purposes or frequently edit repeating events. Smart Update allows you to change repeating event information after a given date and leave past repeating events intact or only change a typo in a given field without overwriting all events in the repeating event.
SmartUpdate editing options will appear after you click the [Save] button when you choose to "Edit all event in this series" in a repeating event.
To edit a repeating event for a date going forward:
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