Hello Hereward,
Of course it would be possible but not adviseable.
If you are wanting it to record attendance but then delete it you're losing all your data.
Our registration sessions and linked to events, without the event there is not registration. So to delete them they are out of date.
We do offer iCal syncing where you can import events continuously with a cron, but this doesn't include any registration information, it's just for event importing.
Many thanks
Tony