Smartupdate provides a way to edit repeating events without overwriting all event occurrences. This is a helpful option if your calendar has a lot of repeating events and you need to keep historical record of individual event content.
Turn on Smartupdate:
Go to Admin Menu> Calendar Options > Advanced tab
Check "Enable Smart Update when editing repeating events" > Save
Click to (edit) event > select "Edit all events in the series" > make updates > Save
Choose to update only the events with a "date on or after" to avoid changing events that occurred prior to that date.
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