TOPIC: How to stop subscriptions multiple events?

I've about 100 events created, but none of them have a closing-date.
Now it seems that there will be a fixed date for closing the subscriptions for all of the events on the same time.
Is it somehow possible to give this variable at once? Or do I have to go through all of the events?

The cut-off date is optional. The registration will close automatically when the event is done. If you need to add a cut-off date/time, this must be done per event. There is no global cut-off date.