Project Owner can re-open the event when event is in "Pending Selection". Once the event has been re-opened, you can use "Surrogate Bidder" function to capture the revised bidding information as part of the event. In this way final bidding information's are captured in the system.
Second option is Project Owner can edit the event and capture the final bidding information as part of the content. Ensure that you are selecting the "Keep, but do not email" option so that notification will not be sent to supplier.