No matter how much preparation goes into planning a release, there may still be a few last-minute new discoveries. It is important how you react to them and maintain a no panic environment.
Track the tasks as per the go-live plan and their dependencies.
Send communications a multiple number of times (on track/ahead or behind, and the like) during the release window (communicate the frequency to all the stakeholders).
The following diagram shows a visual form of communication that you can use to show the status of the release:
Schedule conference calls with the leadership team to provide updates (you need to be giving them proactive updates rather than having them at your back, chasing for updates) as well as the go/no go decisions at specific intervals.
Engage the IT SMEs and business SMEs for data validation. You need to record these tests (reports...