If you want to change something to your Event once the subscriptions have started, there are a number of limitations to what you can still change.
- Once there is a subscription for an Event date, you can no longer change or delete it.
- Once there is an order for a Pre-order item, you can no longer change the price or description or delete the item.
You can still change everything else.
If you really have to ... you must first delete the subsciptions and orders.