You want to clean up your calendar, remove ancient events.
In roundcube, you have to select each event and click delete.
Perhaps export all events starting at a certain date, and then reimport again. But you need to use a new calendar, because you cannot clean the calendar.
It would be good to have some solution for this.
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I agree some solution for cleaning old events could be useful. It could be also a command line utility for admins as they would likely want to keep the database size as small as possible.
For now you can delete and re-create the calendar or go to Settings > Folders and use "Empty" action.