Resolution
Eventually, probably, the PCs will get where they're going and attempt to deal with the threat or seize the opportunity. You'll zoom in on the action, describe the situation, and make GM moves. The PCs will respond and trigger their moves. We'll all find out what happens together.
When prepping the adventure, list the sites, dangers, and discoveries that you expect to feature in the resolution. For each one, do as much preparation as you find valuable. See the following chapters for guidelines on how to prepare these things: