Yes — exporting your calendar as an ICS archive takes less than a minute and gives you a permanent reference to past events without cluttering your live calendar.
Archiving and cleaning are complementary actions. Cleaning removes events from the live calendar so it is easier to use. Archiving creates a permanent record of those events in a file you can store and search if needed.
Store the ICS file in a shared drive folder, organised by calendar name and date range. This gives your team a searchable archive of past calendar data without any of the clutter of having it in the live calendar.