To simplify Live Streaming as much as possible, you should use the same MLE for every broadcast. Create a recurring Live Broadcast Schedule that will keep your Master Live Episode’s date & time current, and at the top of the Episode list.
If you archive a recording of your Live Broadcast (in whole or in part), you can do so to a new Episode, thereby leaving your MLE automatically staged and ready to go for the next event.
This will remove extra steps from your workflow, there is no need to set things up (again) prior to each broadcast. This will also help reduce the risk of human error that could prevent a successful broadcast. Not being able to delete the MLE means your Live Stream Credentials will never change. Simply open your encoder and start the broadcast, week-after-week.