Sorry, but that functionality is not enabled after the event has been published.
Carlos, I wish it was.
We find that it's not so much 'missing' information but changes or more detail i.e. we wish to update the bid decrement because after supplier training, we agreed with the suppliers that our planned bid decrement didn't work, or our stakeholders now have historic pricing, which they didn't have at the time the event was created.
David : did anyone log an Enhancement Request for this already?