If a buyer is changing an event, the event closes for editing. If you want to view the event, you can see the following notifications:
When the buyer finishes making changes and submits the event, a new revision of the event is created and you receive an email notification.
Clicking on the View Event button directs you to the revised event.
When you access the event, you have to accept the changes made by the buyer while entering your response. If you want to upload your response to the revised event using Excel, you have to export the Excel file and import it back with your response.