The brief and checklist that carry your product from "nearly there" to "demo-ready." You will write the one-page brief (what it does, who it is for, what you built) and plan the three-minute walkthrough you will give on Demo Day. Then you run the ship checklist: the URL loads for a stranger, the core action works, the login and data behave, and at least one fix from your eval is in. Treat the checklist as non-negotiable, it is the difference between a demo that lands and one that dies on a detail you could have caught.