Changing a Business Event Date 
Procedure

It is even easier to call this function from the dynamic Business Event Menu. There you simply select the event date you want to change and choose Change with the right mouse button.
If you want to change the business event schedule, proceed as described in
Create Schedule
Attendees who cannot attend on the new date are automatically rebooked for other events or prebooked for the event type. Attendees are notified of the change automatically if you have configured your Correspondence settings accordingly.
If you want to change or add to the resources selected for a business event, refer to:
Selecting ResourcesResult
You have changed the business event date.
See also:
Business Event Dates