Yes the content of deals may be changed during the event however please be aware of approval turnaround times. 

As the deal is being amended it is in the status of OPEN and it will be temporarily removed from the live site.

Once the content is updated and SUBMITTED FOR APPROVAL, the content will be in a queue to be reviewed by the proofing team. 

It is not until the deal is in the status of APPROVED that it will re-appear on the live site.